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Forestry 1959 32(2):155-165; doi:10.1093/forestry/32.2.155
© 1959 by Institute of Chartered Foresters
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CONTROL OF CUTWORM IN FOREST NURSERIES

J. R. ALDHOUS

Forestry Commission

Larvae of Agrotis segetum Schiff (cutworms) damaged seedlings on a light loam soil at Ken nington Nursery, Oxford. Experiments carried out in 1955–7 investigated the effect of BHC, DDT, aldrin, and dieldrin on cutworms and their phytotoxicity to Sitka spruce (Picea sitcbensis) seedlings.

A spray containing 3 lb. aldrin per acre (as a 30 per cent, miscible oil) or 1½ lb. dieldrin per acre (as a 15 per cent, miscible oil) gave excellent control of Agrotis segetum larvae and did no damage to the seedling crop. Both insecticides were applied in 100 gallons water per acre. Immediate control of cutworm was obtained with applications at time of expected larval emergence (mid-June) or at time of first visible crop damage (mid-July); applications one month later gave good control after 3 days.

Stock beds containing seedlings of all the conifers commonly used in Britain have been sprayed in mid-July with aldrin and dieldrin at half the rate used in the experiments. No species was damaged and control of cutworm was good.


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