Abstract
Several new isolates ofBacillus thuringiensis Berliner have shown significantly higher levels of insecticidal activity than the previous best isolates (Bt24-entomocidus and IH-A-aizawai) against bothSpodoptera littoralis Boisd. andSpodoptera exempta Walker. The best ones, in the following descending order of potency, were: againstS. littoralis — K26–21, MF4B–2, MR1–37, K28–30, K26–8; againstS. exempta — Bt-3, K30–3, HD-133, MR1–37, Bt-17, K26–8, K26–21, MF4B-2, HD-593. Larvae ofS. exempta were considerably more susceptible (4.12–1.25 fold) to some of the isolates (Bt-3, K30–3, HD-133, MR1–37, Bt-17, K26–8, HD-593) thanS. littoralis.
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Hamal, M., Brownbridge, M., Broza, M. et al. Screening for highly effective isolates ofBacillus thuringiensis againstSpodoptera exempta andSpodoptera littoralis . Phytoparasitica 19, 9–21 (1991). https://doi.org/10.1007/BF02981007
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DOI: https://doi.org/10.1007/BF02981007