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40 gallons acaricides adult APPLY THE DDT area of tea Assam ASSOCIATION SCIENTIFIC DEPARTMENT attacked by Helopeltis Average number badly attacked bamboo baries Barrier spraying BIOLOGY OF HELOPELTIS Biston suppressaria Bor medeloa brand of DDT bushes wide Calcutta cent DDT collection of chrysalids colour common Looper Caterpillar containing 50 CONTROL OF HELOPELTIS copulation CORNELL UNIVERSITY damaged bush DDT emulsion DDT formulations DDT IN HELOPELTIS DDT spray defoliation dissolving the leaf Dooars drenching spray effective eggs epidemic female garden Geigy's Guesarol hand collection Hare Street hatched Helopeltis attack HELOPELTIS CONTROL Helopeltis damage Helopeltis feeding inches incipient Red spider insect insecticides instar iodine jungle killed laid lay eggs lime-sulphur Looper attack method mosquito moult number of days pamphlet planters pruning Ralli Brothers Ltd saliva shade trees signs of Helopeltis spot spray powder Sprayed bushes SPRAYING MACHINES stage starch Surma Valley tea bushes Tea Estate Tocklai wettable powder young caterpillars