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TY - JOUR AU - Muley1 and R.K. Nimbalkar2*, S.S. Shinde1, V.N. Kamtikar1, Sumit PY - 2011/05/03 Y2 - 2025/09/23 TI - LC50 for Insecticides against Second Instar Larvae of Cotton bollworm Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) in Maharashtra JF - Journal of Ecobiotechnology JA - JEBT VL - 3 IS - 2 SE - REGULAR ISSUE ARTICLES DO - UR - https://www.updatepublishing.com/journal/index.php/jebt/article/view/143 SP - AB - <p class="MsoNormal" style="margin: 6pt 0in 0pt; text-align: justify;"><span style="font-size: 10pt; font-family: ";Arial Narrow";,";sans-serif";; mso-bidi-font-family: Arial;">The present study deals with the efficacy of Spinter, Cypermethrin and Karate was assessed by larval dip bioassay against second instar larvae of cotton bollworm <em>Helicoverpa armigera</em> collected from the cotton fields at Aurangabad and reared in laboratory until F₁ generation second instar larvae are used to assess the toxicity of insecticide after 48 hours of insecticide treatments. The study result shows that toxicity of Karate was highest with LC₅₀ of 70.31ppm followed by Cypermethrin with LC₅₀ 277.67ppm and Spinter 454.85ppm. The result showed the resistance increased in <em>Helicoverpa armigera</em> against Spinter in F₁ generation in laboratory conditions.</span></p> ER -