EFFECT OF SUNLIGHT RADIATION, RAINFALL AND DROPLET SPECTRA OF SPRAYS ON PERSISTENCE OF BACILLUS-THURINGIENSIS DEPOSITS AFTER APPLICATION OFDIPEL(R) 76AF FORMULATION ONTO CONIFERS

Citation
A. Sundaram et Kms. Sundaram, EFFECT OF SUNLIGHT RADIATION, RAINFALL AND DROPLET SPECTRA OF SPRAYS ON PERSISTENCE OF BACILLUS-THURINGIENSIS DEPOSITS AFTER APPLICATION OFDIPEL(R) 76AF FORMULATION ONTO CONIFERS, Journal of environmental science and health. Part B. Pesticides, food contaminants, and agricultural wastes, 31(5), 1996, pp. 1119-1154
Citations number
28
Categorie Soggetti
Agriculture,"Environmental Sciences","Public, Environmental & Occupation Heath
ISSN journal
03601234
Volume
31
Issue
5
Year of publication
1996
Pages
1119 - 1154
Database
ISI
SICI code
0360-1234(1996)31:5<1119:EOSRRA>2.0.ZU;2-J
Abstract
The effect of sunlight radiation, rainfall and droplet spectra of spra ys on persistence of a Bacillus thuringiensis subspp. kurstaki (Btk) f ormulation, DiPel(R) 76AF, was examined after application onto spruce [Picea glauca (Moench) Voss] foliage. The investigation consisted of t hree studies: (i) Study I: a laboratory microcosm study to examine the photostability of DiFel 76AF deposits on foliage after different peri ods of exposure to two radiation intensities, (ii) Study II: a laborat ory microcosm study to examine the rainfastness of foliar deposits aft er exposure to different amounts of rainfall consisting of two separat e droplet spectra, and (iii) Study III: a field microcosm study to inv estigate the influence of two different droplet spectra of DiPel 76AF sprays on foliar persistence of Btk under natural weathering condition s. In all studies, persistence of Btk was investigated both by bioassa y [using spruce budworm (Choristoneura fumiferana Clemens)] and total protein assay.