Evaluation of Different Insecticides against Cabbage Butterfly, Pieris brassicae (L.), Lepidoptera: Pieridae on Broccoli

Abstract

The present study on the evaluation of different insecticides against the cabbage butterfly, Pieris brassicae (L.), Lepidoptera: Pieridae on broccoli was carried out at Vegetable Research and Demonstration Block, VCSG, Uttarakhand University of Horticulture and Forestry, Bharsar, Pauri Garhwal. An experiment was accomplished in a randomized block design with ten treatments and three replications on broccoli cv. Palam Samriddhi. The nine insecticides, namely, neem oil, NSKE + neem oil, onion extract, garlic extract, cow urine, Spinosad 45SC, Indoxacarb 14.5SC, Emamectin benzoate 5SG, Deltamethrin 2.8EC, and water spray as control, were evaluated against cabbage butterfly Pieris brassicae L. on broccoli. Two sprays were given at an interval of 15 days. Observations on the larval population of P. Brassicae, the number of fresh leaves, the number of damaged leaves, and the yield were recorded at 1, 3, 7, 10, and 15 days after each application of insecticides. All treatments were effective over the water-sprayed control plot. Among all treatments, Spinosad 45 SC (7.00) was found highly effective and statistically significant with respect to minimizing larval population, followed by indoxacarb (11.00), Emamectin benzoate (14.33), Deltamethrin (16.00), garlic extract (17.90), onion extract (18.33), NSKE+ neem oil (19.66), Neem oil (21.00), Cow urine (22.66) and control (35.60) after fifteen days of second spray. While after second spray of fifteen days, the minimum insect infestation of 19.30% was found in spinosad treated plot followed by Deltamethrin (23.80%), Emamectin Benzoate (27.60%), Indoxacard (30.10%), neem oil (34.50%), garlic extract (37.10%), NSKE+neem oil (38.00%), onion extract (40.90%), cow urine (42.40%) and control (63.40%), respectively.  The highest yield was resulted in plots treated with Spinosad (219.00q/ha), followed by Deltamethrin (213.82q/ha), Emamectin benzoate (210.24q/ha), Indoxacarb (206.16q/ha), Neem oil (198.01q/ha), NSKE (193.82q/ha), Garlic extract (189.13q/ha), Onion extract (182.96q/ha) and Cow urine (176.90q/ha), as compared to untreated control (90.86 q/ha). , respectively.