DE1905469A1 - Combating unwanted growth in softwood crops - Google Patents

Description

The invention relates to the use of amine salts 2,4,5-trichlorophenoxyacetic acid, especially in a mixture »it a phosphate for the selective control of unwanted growth in coniferous wood crops.

To combat undesirable dicot growth in coniferous trees Some active ingredients are already used, but they have the following disadvantages:

Preparations based on esters of 2,4,5-trichlorophenoxyacetic acid can in coniferous crops - except larch only be used after the crop plants have fully grown in late summer, so that various weeds, such as birch cushions, are difficult to record because of the growth that has already been completed. Furthermore, the objective determination of this date on difficulties in practice caused by climatic and local conditions Differences. In addition, the required removal of the larch is unsatisfactory.

009835/1917

SCHERING AG

- 2 - Patent Department

P.1116.00 / January 28, 1969

Preparations based on 1,1'-dimethyl- ^ 4'-bipyridinium - Dichloride, on the other hand, are sprayed using flat jet nozzles or a shield. However, since the agent kills all the green parts of the plant that have been hit, cultivated plants must be sufficient before spraying be covered, which, however, because of the often difficult accessibility of the Porstkultürflächen and with higher vegetation is hardly possible.

Preparations based on 2,6-dichloro-thio-benzamide become in contrast, scattered. It is used in early spring, with the exception of pine cultures. The time limitation of the use and the exclusion of an important type of wood, the pine, as well as the I need a very precise dosage represent considerable difficulties for the use of these preparations »

There was therefore a great need for a former weed control agent which, without the use of technical protective devices, would combat the woody and herbaceous weeds that predominate there, such as birch cushions, raspberries, blackberries ₉ ragwort, thistles, nettle ^{1, without the use of technical protective devices while fully protecting the very sensitive coniferous wood during the vegetation} and allows others to do more.

00 9 835/1917

SCHERING AG

- 3 - Patent Department

P.1116.00 / January 28, 1969

1905463

The selectively acting agents in cereal crops based on so-called growth substance herbicides, such as 2.-methyl-4-chlorophenoxyacetic acid (MCPA), 2,4-dichlorophenoxyacetic acid (2,4-D), 2,4,5- '£ richlorphenoxyes8etic acid ( 2,4,5-T), a- (2-methyl-4-chlorophenoxy) -propionic acid (CMPP) or their mixtures with water-soluble salts of phosphoric acids (see German patent specification Hr. 1.094.524) appeared to be the least suitable for this purpose to be. Of these, for example, MCPA, 2,4-D and their mixtures either show no action against woody weeds in coniferous crops, while others, for example 2,4,5-esters, their mixtures are MCPA and the mixture of 2,4,5-i ¹ with CMPP, cannot be tolerated by crops during vegetation.

It has now been found that is possible by using at least one amine salt of 2,4,5-T "ichlorphenoxyessigsäure particular in a mixture with a water soluble phosphate, the selective control of unwanted vegetation in Softwood cultures. -

This selective effect is particularly surprising since other selective herbicides mentioned above was, as with the expected damage to the conifers% x, which however is not the case.

009835/1917

SCHERINGAG

- 4 - Patent Department

P. 1116.00 / 28.1.1969

19D5469

Rather, even with application rates of 12-15 kg / ha. ' the conifers are not damaged, while only 6 kg / ha are required to control the weeds.

In the use according to the invention, in particular birch cushions, Broom, dogwood, burdock, blackberry, Ragwort, goldenrod, dog rose, elder and ■. It fights willow trees which are not or only insignificantly damaged by the other growth substance herbicides. : Coniferous wood cultures of the species Picea spec., Pinus spec., Abies spec. and Douglas fir, on the other hand, become complete. spared, so that in these cultures for the first time during the Vegetation enables the full-area control of unwanted vegetation. However, taking into account the current economic situation of the Forestry a crucial factor. For, a successful conifer cultivation and thus an essential Enrichment of the state of ÜSechnik.

The amine salts of 2,4,5-trichiorphenoxyacetic acid are used especially lower dialkylamine salts, preferably the diethylamine salt.

It has also been shown that particularly good results can be achieved with a mixture which, in addition to the

■ "." .- ■ - 5 * -. 009835/1917

_5_ SCHERINGAG

Patent department

P.1116.00 / January 28, 1969

2,4,5-trichlorophenoxyacetic acid is a water-soluble one Contains phosphate, preferably tetrapotassium pyrophosphate, and preferably in a weight ratio of the components of about 1: 1.

It is expediently used in the form of a customary one aqueous spray with the addition of surface-active agents Substances, e.g. B. of polyethoxylated polyoxypropylene.

The following experimental example explains the invention.

Experimental example

In different tests each 6 kg / ha, one Mixture of the following composition

5% 2,4,5-T-diethylamine salt 4-7 »5 % tetrapotassium pyrophosphate

5 % wetting agent based on polyethoxylated poly oxypropylene

dissolved in about 300 - 4-00 1 water / ha in coniferous wood cultures hosed out.

Here the fringe dominated, followed by the fir, Douglas fir, Pine and larch. It turned out that these types of coniferous wood treated with the mixture according to the invention without hesitation can be. Even natural softwood fertilizers were made

- 6 009835/1917

SCHERINGAG

_ 6 _ Patent Department

P.Ill6.00 / 28.1.1969

Exempted with the greatest success and also annual seedlings Pichte, fir, Douglas fir and pine showed good tolerance.

In individual experiments, application rates of up to 10 kg / ha and more well tolerated by the softwoods. at Larchs were observed to have a certain sensitivity but also a pleasing ability to regenerate, so that Occasional engine wrinkles grew rashly overgrown.

The following tables show the effect of the invention Mixture against the most important silvicultural weed species (a) and dhwood species (b) listed in average values on several attempts. For the assessment of the effect, 3 value groups were assigned Basically.

Value number 1-2: very good to well combinable

2-2.5: silvicultural cattle can be controlled sufficiently 2.6-3 s moderate to silvicultural not enough beer can be poured

Also mean

P = spring treatment

S = summer treatment

Z = number of attempts

W = average value figure

- 7 -

008835/1917

. ₇ _ SCHERING AG

Patent department

P.1116.00 / January 28, 1969

Table a)

Effect of the mixture according to the invention with 6 kg / ha against the most important silvicultural weeds -

Burning thistle finger fox gold. Spring willow nettle species hat cruciform herb florets

herb ; ■

ZW ZW ZW ZWZWZWZW

F 7 1.95 9 2.83 2 2.5 12 5 2

S 43 1.29 43 2.06 6 2.35 40 2 3 2.3 4 1.85 39 1.44

008835/1917 " ⁸ '

COPY

Table b)

Effect of. Mixture according to the invention with 6 kg / ha against the most important non-wood species from a silvicultural point of view

CD ö

at to

* J C /)

H ί Q

ff -J-

8 la

ru

OO

Weed birch Z W. broom
broom blackberry hazel raspberry elder pasture Z W Z W Z '■, W Z W Z W Z W Z W

4 ', 1.5'

-2

2 18

■ 7 2.35

S 11 2.23 88 1.39 17 1.33 113 2.13 4 ■ 2 -159, «1.55 47 2.17 15 ' 2.1?

oo
ι

Claims (4)

Claims 1. Combating unwanted growth in coniferous wood crops by using at least one amine salt of 2,4,5-trichlorophenoxyacetic acid, especially in a mixture with a water-soluble phosphate. 2 .. Combating undesired growth in softwood crops according to claim 1 by using a lower dialkylamine salt 2,4 »5-trichlorophenoxyacetic acid, preferably of the diethylamine salt. 3. Control of unwanted growth in coniferous wood crops according to claims 1 and 2 by using an amine salt the 2,4,5-trichlorophenoxyacetic acid mixed with one water soluble phosphate, preferably tetrapotassium pyrophosphate. 4. Control of unwanted growth in coniferous wood crops according to claim 1, 2 and 3 by using a mixture of an amine salt of 2,4,5-trichlorophenoxyacetic acid in Mixture with a phosphate in a weight ratio of about 1: 1. ORIGiNAL IMSPECTED 009835/1917