Isolation and efficacy evaluation of local isolates of Bacillus thuringiensis for the control of Heliothis spp. in tobacco
1993
Agres, E.P. | Truong, H.X. (National Tobacco Administration, Batac, Ilocos Norte (Philippines). Agricultural Research Dept.)
One hundred fifty four Bacillus thuringiensis (B.t.) isolates were taken from soils collected from different tobacco growing areas of Region 1, 2 and Misamis Oriental [Philippines]. Five promising isolates caused 63% to 85% tobacco budworm mortality. Tobacco plants applied with the local B.t. isolates as dust, spray or bait had significantly lower damage (18%-30% damaged leaves) than the untreated plants (36%-42%). When applied as spray, all the isolates gave protection to tobacco similar to that of the commercial B.t. As dust, isolates number 36, 75, and 1091 were similar to the commercial B.t. Among these local isolates, number 75 applied as dust gave the best protection to tobacco against budworm with only 17.8% damaged leaves. Population of the predatory tobacco bug was maintained in the B.t. treated and in the untreated control plants
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