Activity of spore-crystal mixtures of new <i>Bacillus thuringiensis</i> strains against <i>Dendrolimus pini</i> (Lepidoptera: Lasiocampidae) and <i>Spodoptera exigua</i> (Lepidoptera: Noctuidae)
Folia Forestalia Polonica. Seria A, Leśnictwo/Folia forestalia Polonica. Serie A. Forestry