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