caa a22 4500 397571267 CHVBK 20180308164842.0 cr unu---uuuuu 161202e19961001xx s 000 0 eng 10.1093/ee/25.5.1215 doi (NATIONALLICENCE)oxford-10.1093/ee/25.5.1215 Host Plant Effects on Activity of Bacillus thuringiensis Against Gypsy Moth (Lepidoptera: Lymantriidae) Larvae [Elektronische Daten] [Robert R. Farrar, Phyllis A. W. Martin, Richard L. Ridgway] The activity of Bacillus thuringiensis Berliner against larvae of the gypsy moth, Lymantria dispar (L.), was measured initially on field-collected foliage of 17 host trees and a laboratory host (leaf lettuce) dipped in suspensions of B. thuringiensis subsp. kurstaki. Large differences in larval mortality among hosts were found; the amount of B. thuringiensis required to obtain comparable levels of mortality varied > lO-fold among some hosts. White oak, Quercus alba L., and sweetgum, Liquidambar styraciflua L., were selected for further study. Mortality of larvae on foliage treated with B. thuringiensis suspensions of 2 concentrations and held in small cages was higher on white oak than on sweetgum. The amount of B. thuringiensis deposited on white oak and sweetgum foliage, and the amount remaining after 3 d, was measured by extracting, culturing, and counting colonies produced by viable spores. There was a nonsignificant trend toward higher initial deposition of B. thuringiensis on oak than on sweetgum, but only at the high rate of B. thuringiensis. Otherwise, deposition of B. thuringiensis and survival of spores over 3 d did not differ between white oak and sweetgum, and was not closely related to differences in larval mortality. These results indicate that other factors, possibly secondary plant compounds or environmental factors, are involved. © 1996 Entomological Society of America Biological Control nationallicence Bacillus thuringiensis nationallicence gypsy moth nationallicence host plants nationallicence white oak nationallicence sweetgum nationallicence Farrar Robert R. Insect Bioeontrol Laboratory, USDA-ARS, Building 402, BARC-East, Beltsville, MD 20705 aut Martin Phyllis A. W. Insect Bioeontrol Laboratory, USDA-ARS, Building 402, BARC-East, Beltsville, MD 20705 aut Ridgway Richard L. Insect Bioeontrol Laboratory, USDA-ARS, Building 402, BARC-East, Beltsville, MD 20705 aut Environmental Entomology Oxford University Press 25/5(1996-10-01), 1215-1223 0046-225X 25:5<1215 1996 25 ee https://doi.org/10.1093/ee/25.5.1215 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.5.1215 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Farrar Robert R. Insect Bioeontrol Laboratory, USDA-ARS, Building 402, BARC-East, Beltsville, MD 20705 aut NATIONALLICENCE 700 1- Martin Phyllis A. W. Insect Bioeontrol Laboratory, USDA-ARS, Building 402, BARC-East, Beltsville, MD 20705 aut NATIONALLICENCE 700 1- Ridgway Richard L. Insect Bioeontrol Laboratory, USDA-ARS, Building 402, BARC-East, Beltsville, MD 20705 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/5(1996-10-01), 1215-1223 0046-225X 25:5<1215 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford