BLACK-HEADED BUDWORM SPRAYING EXPERIMENTS ON VANCOUVER ISLAND, BRITISH COLUMBIA
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Aerial spraying experiments were carried out against the black-headed budworm, Acleris variana (Fern.), to determine the effectiveness of DDT sprays against the different larval stages, dosage requirements, and time of application. Two series of plots were sprayed, the first against the early-instar larvae and the second against late-instar larvae. Each series received dosages of 1 pound of DDT per Imperial gallon per acre and ½ pound DDT per ½ gallon per acre.Excellent control of larvae in all stages was obtained by the two dosage rates. The degree of control was more closely related to droplet density than to dosage. The best time to begin spraying for maximum foliage protection is when the majority of larvae are in the second instar.
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2002 ◽
Vol 21
(8)
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pp. 1664-1672
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2002 ◽
Vol 21
(8)
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pp. 1664
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2005 ◽
Vol 24
(3)
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pp. 478-494
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2004 ◽
Vol 101
(49)
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pp. 17258-17263
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2003 ◽
Vol 23
(1)
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pp. 120-140
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2006 ◽
Vol 253
(1-4)
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pp. 408-414
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