DE2359226A1 - CONTROL OF NEMATODES - Google Patents

Description

Patent attorney November 27, 1973

Dr. Michael Hann H / D (617)

63 casting. 2359226

Ludwigstrasse 67

PPG Industries, Inc., Pittsburgh, Pennsylvania, USA

CONTROL OF NEMATODES

Priority: November 30, 1972 / USA / Ser. No. 311,044

This invention relates to a method and formulation to control nematodes.

Nematodes have recently been recognized as a major agricultural plague in many areas. These pests are difficult to control there both the nematodes themselves and the neraatode eggs have an extraordinary resistance.

Some nematocids have been developed to control the nematodes, but they do not destroy the nematode eggs with good effect. If such nematocids are used at the usual concentrations that would kill the hatching nematodes, the nematodes will not hatch until the concentration of the nematocide in the soil has dropped below the effective level. There is therefore often a strong over-

4098 2 3/1123

ORIGINAL INSPECTED

A shot amount of the neraatocids used to make a to achieve longer activity of this remedy. Such large amounts of the nematocides are undesirable phytotoxic properties.

It is known that numerous azides, such as sodium azide or potassium azide, in high doses nematocide Have properties · Like the other nematocides, these remedies are only partially satisfactory because, although they have the However, netnatodes themselves do not control their eggs.

The present invention is based on the new observation that relatively low concentrations of a Azids favor the hatching of nematode eggs. Without being able to commit to any theory, It is believed that the azide action can be summarized as follows: Very low concentrations of one Azids in the soil had very little or no effect on the nematodes. Slightly higher concentrations favor the hatching of the nematode eggs without the newly hatched or older nematodes significant control. Higher concentrations kill the nematodes and, in some cases, kill some eggs. The number of eggs killed, if any, is insignificant. At these concentrations a some delay in the hatching of the nematode eggs was observed. Massive or high concentrations of azides also appear to have an ovicidal effect on the nematode eggs, but such dosage levels are ruled out practical and economic reasons.

ORIGSNAL INSPECTED

The invention therefore provides a method for the control of nematodes in the soil, in which one in a soil, containing nematode eggs, incorporates an effective amount of a material to prevent hatching of the nematode eggs to accelerate, and in this soil introduces effective amounts of a nematocids to remove those from the nematode eggs control hatched nematodes.

As a means for accelerating the hatching of the nematode eggs is used in the invention in FIG Usually an azide. The nematocid that is additionally used can be used before, at the same time, or after the addition of the Azids are introduced into the soil. If the nematocide is added before the azide, the time interval should be up to the addition of the azide should not be so great that the netnatocide activity of the nematocide becomes ineffective Level has dropped.

There is much greater freedom as to the time interval between adding when the nematocide after the azide is added, as nematodes emerged from the azide-accelerated hatching are, against the action of the nematocids for the rest of ih.ar Lifespan are sensitive. However, the Nematoc is preferably added before the hatched Nematoae .. have laid a colony of eggs. Usually we the nematocide was introduced into the soil about 30 days after the azide was added.

MJb823 /

The preferred application is the simultaneous use of the azide and the nematocide. this is especially the case when both the azide and the nematocide are used in the form of granules will.

Since the azide is used at concentrations higher than those commonly used to promote the When the eggs are hatched, it can also be used for this purpose after lesser Dosages of azide were used for hatching eggs. A single application of nematocides Amounts of the azide is not effective for the purposes of this invention, since nematocidal amounts are usually are not able to favor the hatching of the eggs and there after a drop in concentration of the azide at such levels as to promote the hatching of the eggs, the nematocidal activity is lost is.

However, it is possible to start with high dosages of azides, such as neraatocide amounts or even larger amounts, add to the soil and after the concentration has dropped so far that the hatching of the eggs is encouraged will add a nematocide, which can be an azide, to kill the hatched nematodes.

In a preferred embodiment, the nematodes are controlled by using a soil, the nematode eggs contains, an effective amount of an azide is added to accelerate the hatching of the nematode eggs,

U 0 n ti / j / 112 3

and an effective amount of a nematocid to control the nematodes hatched from the nematode eggs.

A variety of azides can be used in the practice of the invention. Usually, however Alkali azides, alkaline earth azides, ammonium azide or mixtures thereof are used.

Among the alkali azides, sodium azide, potassium azide and mixtures thereof are preferred, although lithium azide, Rubidium azide and cesium azide can be used.

Ammonium azide can be used to advantage when the presence of alkali or alkaline earth ions is not desired is.

Among the alkaline earth azides, magnesium azide and calcium azide are particularly preferred. But also beryllium azide, Strontium azide, barium azide and mixtures of Alkaline earth azides are useful.

It is also possible to use mixtures of azides from the different groups mentioned above, such as mixtures of potassium azide and calcium azide or av.s. Ammonium azide and an alkali azide or alkaline earth azide.

In general, it is preferred that the azide be in Eng. Ground is present at a concentration at which we in SENT

the hatching of all viable nematode eggs promoted, although remarkable results can also be achieved with such amounts which only promote the hatching of a substantial part of the nematode eggs. Where is the number of later hatching eggs are so small that hardly any damage is done to the agricultural culture. The amount the azide or mixtures of the azides in the soil containing the nematode eggs are typically in the range from about 0.6 to about 34 kg / ha (0.5 lb to 30 lb per acre). Preferred amounts are in the range of about 1.1 to about 23 kg / ha and more preferably in the range of about 1.1 to about 11 kg / ha.

The azide is expediently applied as an aqueous solution. The way in which these solutions are brought in in the soil is not essential and you can, for example, spray, soak, sprinkle and inject use.

The azides can also be used as solutions in ammonia. Here, even anhydrous ammonia can use, but the solubility of most azides is increased by the addition of water. Ammonia solutions of the azides can be used in a similar manner to the aqueous solutions of the azides.

The azides can also be added to the in solid form, e.g. as crystals, granules or finely divided dust

ORIGINAL INSPECTED

Soil can be introduced. If it is desired to use the azide as dust, it can be comminuted to a very fine powder, for example below a particle size of 100 mesh (US Sieve Series). Most often it is desirable to dilute the solid azides with an inert solid diluent such as silica, clay, talc, bentonite, diatomaceous earth, wood flour, and the like. Good distribution of the azide is usually achieved by diluting the azide with an excess of up to 90% of the inert diluent. Sometimes formulations containing from about 5 to about 75%, rarely more than 80 % azide are suitable.

Another effective method of diluting the azide when used as a solid is by applying the azide as an adsorbed component or coating on an inert carrier such as attapulgite clay, monttnorillonite, crushed corn cobs, sawdust, bentonite and the like. The azide can also be in other pesticides, pesticidhaltigen granules or be absorbed on fertilizers or be applied thereon as a coating, alkali metal azide, Erdalkaliazid, ammonium azide, or mixtures thereof make these granular usually less than about 85 wt.%, Although also larger proportions are possible. The range for the azide content of such preparations from about 1 to about 85% by weight is generally a range from

Ü 9 H 2 3/1 1 2 3

-ο -

about 2 to about 50 wt.% preferred «

When the azide hits the ground in Kxistallfornu as Granulate or other solid form is applied, you can leave it on the floor and the normal Expose to weather conditions. More often, however, it is brought into the ground using water. Another option is to add it when plowing or harrowing. In general they can be used for the introduction of the azide using the usual methods for the application of fertilizers and / or pesticides are known to use.

The soil is preferably tilled with the agricultural »culture prior to the application of the azide. This occurs loosening of the soil and it becomes more receptive to the azide. After applying the azide you can known mechanical methods are used for the penetration of the azide into the soil layer, e.g. plowing, harrowing, Piling and the like. The cultivation of the soil ^ nd Although the azide is preferably added together, the two processes can also be carried out separately will. The effectiveness of the azide treatment is demonstrated by Covering the treated soil with a material, e.g. a film that is essentially impermeable to vapor, improved. Such a cover is usually left in place until the azide has decomposed. For this purpose

409823/112

foils can be made from, e.g. polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, poly (ethylene terephthalate) and use waterproof paper «Such a way of working is particularly useful for seed beds and to recommend other cultures of great value.

To apply azide solutions to the floor, equipment previously available for the Application of aqueous ammonia solutions is used. For example, you can use a device with a rod-shaped distributor use one or more knives, each with an injection nozzle for the floor. Another method which can be used to advantage consists in plowing in. Another method is direct injection in the ground. Also spraying the solution can be used to good effect «if a sprinkling of the ground In consideration, the azide can be added to the water flow for the irrigation can be added. To do this, you can dissolve the azide in water and add this solution to the irrigation stream to add. Similarly, aqueous solutions can or solutions of anhydrous ammonia added to the stream will. It is not necessary to add the azide in the form of a solution to such a stream, however, this procedure is preferred because solutions can be measured more easily and more accurately than solids.

BreJ & nirfsäer, distributors and similar devices can also be used for the application of the azide in solid form used to distribute solids.

409823 / T12 3

The field containing neraatodes can be treated with the azide in various ways. You can use the azide
Apply over the entire field, but you can also only treat individual sections of the field, eg only individual rows. Such a treatment has the advantage that it is less expensive than the total treatment. The azide can also be introduced into furrows, optionally together with a fertilizer. If the azide is added in the furrow or in the like during planting, it can advantageously be placed below, on one or both sides of the seedling or the seed. A striped treatment is for plants that are in rows with
can be cultivated at a great distance, such as orchards, vineyards, other gardens and the like. In such a case, the treated strip is usually about 1.8 to about 3.6 m wide and the plant is located in its center. Such a method of treatment is also cheaper than treating the total field, but has the disadvantage that there is a risk that nematodes or nematode eggs will be transferred from the neighboring and untreated soil to the treated area. Point-like treatment can be of interest
in the case of a localized nematode infestation.

Any compound or
Mixture of compounds can be used, which is suitable for the control of nematodes. Some such nematocides are commercially available. As already stated, an azide can also be used as a nematocide,

however, organic nematocids are preferred in the invention. The nematocides with a relatively high molecular weight ρ which are very effective in the invention of 4; include. 2 ₈ 3 ~ dihydro-2,2-diraethyl ° 7 = benzofuranyl-N = methylcarbanate, sodium N-methyldithiocarbamate, Ö-ethyl-SjS-dipropyl- ■ phosphorodithioate, Q ₉ O-diethyl-O-fp- (methylsulfinyl) -phenylpho-sphorthioate, 0, O-rdiethyl-O-2 _s 4-> dichlorophenylphosphorothioate, 0, (3-diathy 3L = O- (2-pyrazinyl) phosphorothioate, 0 _> 0-diethyl-0- (2 -isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate; mixtures of 0, Q-diethyi-0 "= (2-isQpropyl-6-methyl-4-pyrimidinyl) phosphorothioate and 1,1,1" trichloro "2,2 -bis- (p-methoxyphenyl) ethane; ethyl-4- (methylthio) -m-tolyl-isopropylphosphoramidate, O-phenyl-N _? N'-dimethylphosphordiamidate, S-methyl-N- [] (methylcarbamoyl) oxy} thioacetimidate, 1-PhenyI-3- (O _i> 0 ~ diethylthionophosphoryl) -1, 2,4-triazole, tetrahydro-3,5-dimethyl-2H-1, 3,5-tliiadiaziB ™ 2-tmon and 2-methyl-2 - (Methy.-thio) propionaldehyde-O- (methylcarbamoyl) oxime. The nemato.cides of relatively low molecular weight, the so-called contact smokers, which can be used in the invention include trichloronitrometh an, bromomethane, mixtures of bromomethane and trichloronitromethane, 1,2 · dibromoethane, mixtures of 1,2-dibromoethane and carbon tetrachloride, 1,2-dibromo-3-chloropropane, 1,3-dichloropropeny mixtures of 1,3-dichloropropene and trichloronitromethane , Mixtures of dichloropropane and dichloropropene, mixtures of 1,3-dichloropropene _s dichloropropane dichloropropene and 1,2-dibromoethane, mixtures of trichloronitroethylene, dichloropropene and other chlorinated hydrocarbons, mixtures of 1,3-diehlorprQpa% 3 ₉ 3-dichloropropene, 1 , 2-dichloropropane,

409823/112 ^

BATH ORIGINAL

2,3-dichloropropene and similar C, chlorinated hydrocarbons, mixtures of trichloronitromethane, 1,3-dichloropropene, 3,3-dichloropropene, 1,2-dichloropropane, 2,3-dichloropropene and similar chlorinated, C ₃ hydrocarbons and mixtures of methyl isocyanate and chlorinated C ₃ hydrocarbons.

The amount of nematocid applied can vary within wide limits depending on a number of factors such as type of nematocid, type of nematode, number of nematodes in the soil, and type and temperature of the soil. If a commercially available nematocid is used, it is advisable to follow the instructions given by the manufacturer on the packaging. Typically, the nematocid is applied in amounts from about 0.6 to about 1200 kg / ha (0.5 to 1000 lbs per acre). The concentration is often in the range from 1.2 to 900 kg / ha. Quantities in the range from about 2.3 to about 230 kg / ha are preferred. As a rule, the higher molecular organic nematocides are used in amounts of about 0.6 to about 60 kg / ha. About 1.2 to about 28 kg / ha are used more frequently, amounts of about 2.3 to about 23 kg / ha are particularly preferred. The nematocids serving as fumigants are generally used in higher amounts than the high molecular weight organic nematocids. The amounts of these nematocids are usually in the range from about 3.4 to about 1200 kg / ha. Amounts ranging from about 6 to

around 600 kg / ha is more typical. Quantities are preferred from about 11 to about 230 kg / ha used «If the azide used as a neraatocid, it is commonly used in Amounts of about 11 to about 110 kg / ha are used, with amounts of about 23 to about 60 kg / ha being preferred.

As already stated, the customary Nematocide should be used in the manner recommended by the manufacturer. In addition, the fixed liquid nematocidal formulations by any of the Methods described above are applied. Gaseous nematocids can be injected into the soil or used under a tarpaulin.

In addition, solid or liquid nematocidal preparations can often be formulated together with the azide. The formulation obtained can be used in an expedient manner for the joint application of the azide and the nematocide. As a rule, the azide and the neraatocid are present in granules as adsorbed constituents or coatings on inert filler particles such as attapulgite, motttmorillonite, ground corn on the cob, sawdust, bentonite and the like. The azide and the nematocide can be present on the same carrier particle or on separate carrier particles. Mixtures of granules containing the azide and granules containing the nematocide are particularly effective. Both in the case of solid and in the case of liquid formulations, the amounts of the azide and of the nematocide are generally chosen so that, when used, both the azide and the nematocide are present in such amounts that

4 09823/1123

they can do their jobs.

example 1

In the spring, a field that has a soil with a pH of 6.3 and which is known to be susceptible to nematodes and pod rot disease, prepared for peanut planting. Of the Field is divided into sections from 4.1 to 50 m.

One field is filled with 9 kg of 10% potassium azide granules per hectare, 4.5 kg of 7.5% 0,0-diethyl-S- [2- (ethylthio) ethyl phosphorodithioate formulation per ha and 4.5 kg 7.5% OjO-diethyl-O-fp-CmethylsulfinyDphenyfJphosphorthioat formulation treated. The treatment agents are then mechanically introduced into the soil. To the At the time of planting, 3.6 kg of 7.5% Di-Syston insecticide are used introduced into the seed furrow per hectare. A non-treated department is used for comparison. In addition, the usual agricultural practices, including the use of Herbicide and fertilizers applied. In autumn the fruit is harvested and soil samples are used for counting taken from the nematode. The results are given in Tables I and II.

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Table I.

Nematode sample

Nematodes

Number of nematodes in 0.47 liters of soil

treated untreated

Meloidogyne, spp. Pratylenchus brachyurus TyIenchorhynchus, spp _e Cr iconemo ides, spp.

925

325

300

Table II Treatment at with Nematodes infected fields Effect of Yield
kg / ha quality
$ / CWt value
$ / ha Fields 4 700
3 600 36.2
35.8 1 510
1 145 treated
untreated

Examples 2 to

In the spring a field becomes A which is known to be
infected with nematodes and seed-shell rot, prepared for growing peanuts. It will be the

409823 / 11.2 'p

following different times and methods for application who uses chemicals:

Application of chemicals before planting: The test chemicals are applied 14 days before planting. Granular formulations of the test chemicals are placed in a 30 cm wide band across the row 12.7 cm deep. The rows are at a distance of 24 cm. Liquid formulations of the test chemicals are placed 20 cm deep in the center of the row and the soil surface is sealed with a pressure roller. The temperature and humidity of the soil are ideal for soil smoke application. S-propyl-Ν, Ν-dipropylthiocarbamate is applied 2 days before planting at a dosage of 2.8 kg / ha.

Use of Chemicals in Planting: Peanuts are planted on the same day that the test chemicals are added to the field. The granular formulations and the liquid formulations of the test chemicals are applied in the same way as for the addition before planting.

The temperature and the humidity are ideal for the use of the floor smoke

4O.a823 / 1 1 23

Application of chemicals at the time of the first seedlings (early pegging); 42 days after planting, granulate formulations of the test chemicals are applied to a 30 cm wide tape with the row of plants in the center. At this point the first seedlings (pegs) penetrate the soil. The application is on the dry vines and a piece of heavy canvas is attached to the applicator for the granules to shake the vine and allow the test chemicals to fall onto the soil surface.

Replications of each treatment are made.

37 days after the peanuts are planted, the plants are examined to determine if the chemicals are phytotoxic or promote plant growth. Plant growth is assessed in the tables according to the following index: 10 = excellent growth; 15 = good growth; 20 = satisfactory growth; 30 ^β poor growth; 40. = »Severely damaged plants.

118 days after planting, the percentage of seed coat putrefaction (pod rot disease) is determined, and one plant is dug up from 4 locations per treated row per replication. The soil in the fruit area of each plant is examined for healthy or rotten peanut seed shells and the seed shells are removed

£ 0 98 2.3 / 1 123

put in a paper bag with the plant from that location. The individual plants are washed and all seed coats are removed by hand. The healthy and diseased shells are separated and counted per plant. The percentage of diseased pods removed is calculated for each plant. the Individual percentages for each of the 16 plants from each treatment are then averaged to the mean percentage to determine on seed coat putrefaction.

The nematode populations are determined by a Mixture of 10 soil samples is prepared in one Depth of 15 cm per replica 134 days after planting were taken. The flotation-centrifugation method is used to extract neraatodes from 250 ml of soil per replicate by W.W. Osborne, Sourcebook of Laboratory Exercies in Plant Pathology, (1967), W.H. Freeman and Company, San Francisco, pages 105-106. The results of 4 replicas for each treatment will be determined.

The peanuts are made with usual agricultural Devices dug out 141 days after planting and 148 position after planting combined with usual means (stationery peanut combine). Immediately after combining, the peanuts are in the shell to a moisture content of

12% dried, weighed and placed in a drying room for Stored for 2 months before a sample is taken from each replica for evaluation. It will be the yield for

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each replica is calculated. The returns and the ratings for the 4 replicates are determined for each treatment. The mean values per ha for each treatment and the increase or decrease compared to calculated for the untreated fields.

The results are summarized in Table III,
in the column "Dosage" the applied amount of
The formulation for the rows of plants per hectare of the field, including the treated strips and the untreated spaces between the strips, indicates »The abbreviations have the following meanings:

ha = hectare

AI = active ingredient G = granules

MeIo = Meloidogyne, spp.

Crico = Criconemoides, spp.

BeIo = Beionolairaus, spp.

Tylen - Tylenchorhynchus, spp.

Rotylen = Rotylenchus, spp.

Xiphi = Xiphinema, spp.

NI = O-ethyl-SjS-dipropylphosphorodithioate (Mocap) NII = »1,2-dibromo-3-chloropropane (Nemagon) NIII = 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-N-methylene carbamate (Furadan)

U y 8 2 3 / Ί 1 2

Effect of azide and nematocide on Acker A

Table III example

Preplant application

Planting application

Ke imapplication

Chetnikal and formulation

Plant growth index

Dosage Cheraikal and Dosage Chemik. and Dos. Formulation formulation

ο
cc
cc

II
III

IV

VI

NaN ₃ , 8% G.

NaN ₃ , 8% G.

NaN ₃ , 8% G.

NaN ₃ , 8% G.

NaN ₃ , 8% G.

Untreated Field - · -

74 kg / ha NI, 10% G AI / 23 kg / ha no 74 kg / ha NII,
12.1
gal Ib AI / 7th l / ha no 74 kg / ha NII
12.1
gal Ib AI / 7th l / ha Terraclo
10% G 74 kg / ha NIII , 10% G 23 kg / ha no 37 kg / ha NII
12.1
gal Ib 7th l / ha no

20.0 22.5

20.0

10.0 25.0

27.5

cn

OK

(O

ro

Table III (continued)

% Seed coat nematode genera and - quality yield value
putrefaction counts per $ 250ml / cwt. kg / ha $ / ha

floor

HeIo Crico BeIo

17.0 43 48 3 14.06 3 390 1 005 18.1. 10 3 0 13.70 3 070 927 16.1 3 3 0 14.34 4th 310 1 370 O
cc 18.1 10 0 18th 14.26 3 140 . 1 .000 OO
N> .28.9 38 400 0 14.03 3 042 988 CO .30.3 850 253 15th 13.80 2 885 . 880 ω

Examples 7-11

The procedure of Examples 2 to 6 is carried out on a Field B of another farm is repeated in the following order:

Action days after

plants

Preplanting application -19

Planting application 0

Determination of the plant growth index 29

Germination Application 36

Determination of seed coat putrefaction 113

Soil pattern for nematode enumeration 127

Dig 142

Combine 156

The results are shown in Table VI.

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Table VI

cc

fs.

Example pre-planting application planting application germination application plant wax chemistry. and dosing chemistry. and Dos. Ctiemics. and Dos. Index formulation formulation formulation

VII
VIII

IX

X
XI

NaN ₃ , 8% w. NaN ₃ , 8% w

NaN ₃ , 8% G.

NaN ₃ , 8% w. NaN ₃ , 8% w

untreated he

Field · "· - · < kg / ha NI, 10% G 23 kg / ha none ——

kg / ha NII, 7 l / ha none
12.1 Ib AI /
gal

74 kg / ha NII 7 l / ha Terraclor 120 kg / ha
12.1 Ib AI / 10% G
gäl

kg / ha NIII, 10% G 23 kg / ha none ^ -r-

kg / ha NII 7 l / ha none "

12.1 Ib AI /
gal

28
23

28

10
25th

30th

ro

CjO

cn

CD K) K) CD

Table IV (continued)

2 *> f

CO

m σ

% Seed coats
putrefaction Nematode Genera and
Counts per 250 ml
floor Crico BeIo quality
$ / cwt Yield
kg / ha value
$ / ha 2359 I. MeIo 10 0 to 4.2 33 0 0 13.52 4,786 1 410 I. 12.5 2 5 0 12.94 4 430 1 270 26.4 85 8th 0 13.02 4 240 1 220 8.0 30th 8th 0 14.30 5,000 1 575 14.0 6th 3. 0 13.62 4 710 1 355 20.6 425 13.68 4 140 1 258

CD

Examples 12 to 16

The procedure of Examples 2 to 6 is repeated on a field C on another farm, with the exception that the time series are as follows:

Action days after

plants

Preplant application. -15

Plant application '0

Determination of the plant growth index 34

Germination Application 41

Determination of seed coat putrefaction. 118

Soil pattern for nematode enumeration 132

Excavation 155

Combine 175

The results are shown in Table V.

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ORIGINAL INS-PEGTED

Table V example

Before ρ f lanzapplication

Ff lance application

Ke imapplication

Chemical and formulation

Plant growth index

Dosing chemical and Dosing Cheraik. and Dos. Formulation Continuation

XII
XIII

£ χιν

co co ro co XV

-> XVI

NaN ₃ , 8% w. NaN ₃ , 8% w

NaN ₃ , 8% G.

NaN ₃ , 8% w. NaN ₃ , 8% w

Untreated e 11 er
Field --- ·

74 kg / ha NI, 10% G AI / 23 kg / ha no 74 kg / ha NII,
12.1
gal Ib AI / 7th l / ha no 74 kg / ha NII
12.1
gal Ib AI / 7th l / ha Terraclor
10% G 74 kg / ha NIII , 10% G 23 kg / ha no 37 kg / ha NII
12.1
gal Ib 7th l / ha no
i

12.5

22.5

kg / ha 27.5 10.0

- 2o; o

17.5

GJ

cn

CO N) K) CD

Table V (continued)

O CO OO N> CO

% Seed coats
putrefaction MeIo. Nematode Genera and
Counts per 250 ral 0 Xiphis floor quality
$ / cwt Yield
kg / ha value
$ / ha ro
U)
/ fi 18th Tylen rotylen 3 0 Crico KJi
CO 15.3 18th 0 3 0 48 15.18 2,940 996 K) 16.4 40 0 3 5 18th 14.72 3,000 972 CD 21.7 45 0 0 0 66 14.48 3 440 1 110 10.7 25th 3 . 3 ■ 5 10 15.25 3 130 1 050 I. 8.5 168 0 20th 28 14.95 " 3 280 1,080 10.0 10 48 14.77 2,770 926

In the above examples, the invention is carried out using azides to accelerate the Hatching of neraatode eggs explained; let it however, other compounds which serve the same purpose can also be used in the invention. It is complete it goes without saying that the compounds used for this purpose should be compatible with the nematocids. Examples of other materials that act as well as azides to speed up the hatching of nematode eggs are hydrogen peroxide, zinc chloride, cadmium chloride, zinc sulfate, zinc nitrate, ammonium molybdate, Lead acetate, aluminum chloride, manganese chloride, cobalt chloride, Iron (II) sulfate, zinc acetate, cadmium sulfate, barium chloride, Calcium chloride, cadmium nitrate, ferrous ammonium sulfate, lead nitrate, potassium chloride, ferric chloride, sodium chloride and cupric chloride.

409823/112

Claims (23)

Claims (a) In soil containing nematode eggs, one incorporates an effective amount of a material to accelerate the hatching of the nematode eggs and · (b) additionally introduces into this soil an effective amount of a nematocid to remove those from the eggs control hatched nematodes. 2. The method according to claim 1, characterized in that one is used for acceleration an azide is used to prevent the hatching of the nematode eggs. - · 3. The method according to claim 2, characterized e ichnet that the azide is an alkali azide, alkaline earth azide, ammonium azide or mixtures of one such azides are used. 4. The method according to any one of claims 1 to 3, characterized gekennze ichnet that you can get about 0.6 to about 34 kg / ha used. 40 982 3/112 3 5. The method according to any one of claims 1 to 4, d adurch characterized in that an organic nematocide is used. 6. The method according to any one of claims 1 to 5, characterized in that the nematocid is 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-N-methylcarbamate, O-ethyl-S, S-dipropylphosphorodithioate, 0, 0-diethyl-0- £ p (methylsulfinyl) phenyl / phosphorotioate, 1,3-dichloropropene, mixtures of 1,3-dichloropropene and trichloronitromethane, mixtures of 1,3-dichloropropene, 3,3-dichloropropene, 1,2-dichloropropane _? 2,3-dichloropropene, similar C-chlorinated hydrocarbons or mixtures of methyl isocyanate and chlorinated C-hydrocarbons are used. 7. The method according to any one of claims 1 to 6, characterized characterized in that the azide and the nematocide are applied simultaneously. 8. The method according to any one of claims 1 to 6, d adurch characterized in that the nematocide is applied after the azide. 9. The method according to claim 8, characterized in that that the nematocide within about 30 days of application of the azide is applied. 409823/1123 10. The method according to any one of claims 1 to 6, characterized marked that plants to be planted in the ground after the azide and the nematocid have been introduced. 11. The method according to claim 2, since you ν c hg e- k en η ze i c h ne t, · that plant seeds in the Soil is introduced after the azide and the Nematocid were applied. 12. The method according to claim 2, characterized in that k e η η ζ e ic h η e t that as azide sodium azide, Potassium azide or mixtures thereof can be used. 13. The method according to claim 12, d a d u r c h g ek e η η ζ e i c h η e, t that the nematocide 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-N- ^ methylcarbamate is used. . 14. The method according to claim 12, characterized in that k e η η ζ ei c h η e t that as a nematocid O-ethyl-S, S-dipropylphosphorodithioate is used, 15. The method of claim 12, dadurchg e- ke η η ζ eic h η et _f that the nematocide used is Ö, ö-dietliyl '0- £ p (methy 1 sul f iny 1) ρ1ιεη3 ^ IJ phosphor ti oat. ^ 0982.3 / 1.123 16. Nematode control formulation identified by a content (a) a material that is capable of hatching of nematode eggs when it is added to a soil, the nematode eggs contains, and (b) an organic nematocid that is capable of secreting the nematode hatched from the nematode eggs oden to check * 17. Formulation according to claim 16, characterized in that that it is used as a material to accelerate the hatching of the nematode eggs Contains alkali azide, alkaline earth azide, ammonium azide or mixtures thereof. 18. Formulation according to claim 17, characterized in that it is a mixture of granules which contain the azide and granules which contain the organic nematocide. 19. Formulation according to claim 17, characterized in that the azide and the nematocide are present on inert carrier particles. 20. Formulation according to claim 17, characterized in that that the azide is sodium azide, potassium azide, or a mixture thereof. 409823/1 123 21 «Formulation according to claim 20, characterized thereby Inet that the nematocide 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-N-methylcarbamate is. 22. Formulation according to claim 20, characterized Ichnet that the neraatocid Q-ethyl-S, S-dipropylphosphorditioat is. 23. Formulation according to claim 20, characterized Inet that the nematocide is 0,0-diethyl · 0- £ p- (methyl sulfinyl) phenyl ^] phosphorothioate. 409823/1123