Chemical Control of Wireworms in Winter Wheat in the East Midlands, 1966–68

Abstract

SUMMARY Two trials were laid down with organochlorine seed dressings (gamma‐BHC, aldrin and dieldrin) and one spray application (aldrin) as standards. Various organophosphorus seed dressings and granules (applied broadcast before drilling or combine‐drilled) were also used. All treatments yielded significantly better than the controls in both trials except chlorfenvinphos, ‘Dursban’ and N2790, the first being significantly lower in the 1966–67 trial at the five per cent level and almost so in 1967–68. Parathion granules proved particularly effective, comparable to the best organochlorine, with the broadcast slightly better than the combine‐drilled treatment. Trichloronate and N2790 gave lower yields than parathion, but those from the latter were reduced by waterlogging. Phytotoxicity resulted in a poor establishment with the ‘Dursban’ formulation as did the liquid dressing of chlorfenvinphos in the 1967–68 trial, although this was not so apparent in the earlier trial with the 2 oz per bushel (2 g/kg) powder dressing. Ethion did not delay germination and, whilst it appeared to show activity during the autumn feeding phase, there was evidence that it, and chlorfenvinphos, afforded little protection later in the season.

Development of a Rapid Determination of Pesticides in Coated Seeds Using a High-Performance Liquid Chromatography−UV Detection System

“…From the harvest to the culture, through storage and sowing, seeds are constantly threatened by fungi (such as Fusarium and Pythium , ), diseases (like smut ), insects (such as wireworms ), rodents or birds. Thus, seeds are currently treated with water-based flowable concentrates, which are generally a combination of insecticides, fungicides and repellents.…”