DE1246313B - Soil insecticide - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

AOIn

1 N

German class: 451 - 7/04

Number:
File number:
Registration date:
Display day:

1246 313
M 60736IV a / 451 April 22, 1964 August 3, 1967

This invention relates to new soil insecticides, which are particularly useful for the control of those insects which the soil during the Larval or pupation stages infested. In particular, the invention relates to agents containing parathion with extended service life.

Parathion is a well-known and widely used insecticide that is used to control Soil infestation stages of many insects is used. The parathion does not have a long effectiveness, which enables control of unpleasant organisms to be maintained over a long period of time. Although parathion is toxic to most forms of animal and vegetative life, it appears to be caused to decay by certain organisms found in the soil. the Soil microorganisms are so diverse and so numerous that they are opposite adaptable to any conditions that may exist in the soil. The parathion like that like many other organic compounds, is decomposed by some strains of these organisms, although in high concentrations it is very toxic to many soil microorganisms.

The special soil microorganisms that decompose »5 parathion survive its toxic effects, and therefore the entire soil organisms decrease in their ability to decompose parathion, apparently too. Obviously, through this selection, special microorganisms in formed in the soil and developed strains which are effective for the disintegration of parathion. Acquaintance Stabilizers for parathion, such as ethylene glycol, are ineffective in this regard, since they only work during storage, but are ineffective against soil organisms.

The object of the invention is to create a means in which the disintegration of parathion in the ground is delayed. It has now been found that pentachlorophenol, although this subject of the Decay by soil microorganisms is related to the decay of parathion due to its toxic effect can delay the soil organisms concerned.

The invention accordingly relates to a soil insecticide with a content of parathion and a stabilizing agent, which is characterized by that it contains pentachlrophenol as the latter. Preferred preparations are those which 50 to Contain 95 parts by weight of parathion and 5 to 50 parts by weight of pentachlorophenol. If this If desired, insecticidal mixtures can be made with a variety of insecticidal adjuvants.

Soil insecticide

Applicant:

Monsanto Company, St. Louis, Mo. (V. St. A.)

Representative:

Dr. M. Owl, Dr. W. J. Berg

and Dipl.-Ing. O. Stapf, patent attorneys,

Munich 2, Hilblestr. 20th

Named as inventor:

John Miley Deming, Hazelwood, Mo. (V. St. A.)

Claimed priority:

V. St. v. America April 22, 1963 (274 790)

Of particular use are the solid granular carriers, and especially those which have the Have the ability to absorb or adsorb the active ingredients, for example bentonites, attapulgite, IUk, activated charcoal, diatomaceous earth, dehydrated silica gel, and vermiculite. Around the distribution of the parathion agents according to the invention to support and prevent local excesses of the toxic active ingredients, it is desirable Grains of relatively uniform particle size, e.g. corresponding to a number from about four to forty, and preferably from eight to sixteen meshes per seven centimeter use.

Vermiculite is particularly useful as a carrier because it can easily get through the desired size Crushing and sieving can be adjusted and the formed grains against destruction by Abrasion and other mechanical forces are relatively resistant. Vermiculite is also an excellent one Absorbent and can be more than 100% of its own weight on the invention Take up parathion-pentachlorophenol mixture.

The granular soil insecticides according to the invention can be from 30 to 95 percent by weight inert. kö |

709J

Some mineral, containing from 4 to 50% perfume and from 1 to 30% pentachlorophenol. You wise a particularly long effectiveness when higher proportions of parathion are used, for example from 10 to 50% parathion. To these amounts To absorb parathion and pentachlorophenol, it is necessary to have a very strong absorbent Use a carrier such as vermiculite. To absorb smaller amounts of the active ingredient mixture, Clays such as bentonites and attapulgites are useful, although vermiculite can also be used in this area. Preferred granular soil treatment preparations are those which 50 to 90% vermiculite with 5 to 35% parathion and from 5 to 25% pentachlorophenol or 40 to 85% »5 granular vermiculite containing 10 to 50% parathion and 5 to 50% pentachlorophenol. The porous carrier materials cause an additional extension of the Effectiveness of the designated insecticide.

In general, the designated "" contain Average 10 to 200%, preferably 10 to 100%, pentachlorophenol, based on parathion. The grainy one Carrier, preferably vermiculite, is in extent from 100 to 500 percent by weight based on parathion is present.

The preparations can be applied to the soil by uniform deposition of the same on the soil surface or they can be applied to the top layers of the soil by rakes, harrows or other cultivation methods can be introduced. 3 «· The amount of the toxic agent used will be approximately that which is conventionally used the treatment of soil with parathion is used. In particular, about 1.1 to 11 kg / ha can be used of the parathion-pentachlorophenol mixture according to the specification into the surface layers of the soil . incorporate. The application can be done at different times to have a prolonged effect create. If a large number of applications are required, the time between applications when using the specified Medium be much longer than pentachlorophenol-free parathion preparations. In some cases a single application can be enough for a full growing season, or at least so long until the plants are firmly established or so strong that they can withstand the insect larvae.

Experimental investigations were carried out with 100 g of moist soil at 100 ° C. in glass pots. The granular carrier with added para thion and with varying proportions of pentachlorophenol was used in amounts increasing from about 1 to 56 kg / ha added with treatments of 15 cm deep and 10 cm wide strips at a distance 91 cm were used as a basis.

example 1

Preparations of 50 parts vermiculite, and 50 parts of parathion containing from 0 to 50 parts pentachlorophenol, was aged at 100 G ^0. The soil samples were checked for their parathion content after the times given in the table below.

f _A JU Parts Parts ° / · remaining parathion after 2 mo lCllC
Vprtni Parathion Penta naten T Φ1 1111
culit chlorine 1 month 36 50 phenol 1 week 70 35 50 50 0 90 88 56 50 50 10 104 84 47 50 50 20th 86 53 50 50 30th 94 82 56 50 50 40 100 81 10 50 20th 50 93 36 24 80 20th 0 82 62 35 80 20th 10 87 66 80 20th -

The table shows that the long effectiveness of parathion in the soil is due to the presence of Pentachlorophenol is enlarged.

Example 2

The procedure of Example 1 was repeated with the exception that preparations of 40% parathion with various proportions of vermiculite and Pentachlorophenol were investigated.

/ ·
Parathion Vo Vo remaining 41 days Vermiculite Pentachlor Parathion after 54 40 phenol 22 days 60 60 40 0 67 58 59 40 1 77 59 58 40 2 73 59 56 40 4th 78 62 54 40 6th 74 52 8th 79

Example 3

Other preparations with lower parathion content were checked.

Vt Vermiculite

80

60 60

V « Parathion

20th 20th 20th

V

Pentachlorophenol

0 10 20th

V »remaining Parathion after

10 days I 30 days

80 94 92

50 70 68

These figures show that improvements in effectiveness through the addition of pentachlorophenol could be obtained even with only 25% parathion content, based on vermiculite.

Claims (2)

Patent claims: 1. Soil insecticide containing parathion and a stabilizing agent, thereby characterized in that it contains pentachlorophenol as the latter. 2. Soil insecticide according to claim 1, characterized by a content of 50 to 95 parts by weight of parathion per 5 to 50 parts by weight Pentachlorophenol. Considered publications: U.S. Patent No. 2,927,882. 709 619/668 7.67 O Bundesdruckerei Berlin