Biological control of Dutch elm disease:Bacillus thuringiensisas a potential control agent forScolytus scolytusandS. multistriatus

摘要

Jassim, H.K., Foster, H.A.Fairhurst, C.P. 1990. Biological control of Dutch elm disease:Bacillus thuringiensisas a potential control agent forScolytus scolytusandS. multistriatus. Journal of Applied Bacteriology69, 563–568.The effects of exposing fifth instar larvae ofScolytus scolytusandS. multistriatusto spore suspensions ofBacillusspp. were investigated.Bacillus thuringiensisser 3a, 3b increased the mortality of larvae cultured on an artificial medium from approximately 20 in control cultures to over 80 in cultures exposed to the bacteria. The mortality was dose‐dependent forS. multistriatusand the approximate LC50value was 2.2 times 103spores/ml. Different serotypes of B. thuringiensis caused different levels of mortality: H6 produced the highest mortality and H1 the lowest.Bacillus alveiandB. cereuswere also pathogenic butB. megateriumwas not. The results are discussed in relation to the mechanism of pathogenicity and the potential for the use ofB. thuringiensisfor the control of the vectors of Dutch elm dise