Study of Knock down Toxicity of Cassia fistula extract treated Euschitus servus

Abstract

Euschistus servus (Hemiptera: Pentatomidae) commonly known as brown stink bug are serious insect pests of soybean crop. This pests feeding reduces crop yields, decline crop quality, induces delayed crop maturity and increases wounds tissues allowing easy pathogen entry. Recent investigation showed effective control of Euschistus servus with Cassia fistula leaf and flower essential oils as evaluated by KD toxicity. The values of KD₁₀₀, KD₅₀, KD₀ and sub-lethal concentration were found out and data was tabulated in table 1-2. Results showed that Cassia fistula plant extract had a higher toxicity on all nymphal instar stage of brown stink bug.