PERSISTENCE OF BACILLUS-THURINGIENSIS IN 2 FORMULATIONS APPLIED BY HELICOPTER AGAINST THE WESTERN SPRUCE BUDWORM (LEPIDOPTERA, TORTRICIDAE) IN NORTH CENTRAL OREGON

被引:15
作者
BECKWITH, RC
STELZER, MJ
机构
关键词
D O I
10.1093/jee/80.1.204
中图分类号
Q96 [昆虫学];
学科分类号
摘要
Inactivation rates of Bacillus thuringiensus were determined for two formulations applied at 20 and 30 billion international units/ha by helicopter against the western spruce budworm, Choristoneura occidentalis Freeman [Oregon, USA]. The number of days before spray residues declined to 50% of original activity varied with the dosage. Because inactivation rates of the four treatments were approximately equal, success of a B. thuringiensis control program apparently depends more on the initial rate of larval mortality than on the persistence of the microbial agent.
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页码:204 / 207
页数:4
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