Bioefficacy of wild plant extract for biological control of insect pests of Bt cotton

Abstract

Wild plant fruit extract such as hinganbet, Balanites roxburghii, ritthaa/soap nut, Sapindus trifoliatus, shikekaaee, Acacia concinna, Neem, Azadirachta indica, Karanj, Pongamia pinnata and vekhand, Acorus calamus L. were evaluated to screen their efficiency for the control of sucking pests of Bt cotton during Kharif 2009 to 2012 at Cotton Improvement Project, Mahatma Phule Krishi Vidyapeeth, Rahuri. All the organic pesticide treatments were superior over untreated control. Among the evaluated organic pesticides the treatment with 5 per cent hingan bet extract @ 2 litre per hectare was observed to be effective in reducing pest population in which aphids, jassids, thrips and whiteflies of 22.68, 8.16, 14.53 and 10.97 per three leaves, respectively, were recorded with the seed cotton yield of 20.77 quintal per hectare. However, this treatment was statistically at par with 5 per cent ritthaa extract @ 2 litre per hectare. The treatment with 5 per cent ritthaa extract recorded aphids, jassids, thrips and whiteflies of 23.16, 9.87, 15.34 and 12.65 per three leaves, respectively, with the seed cotton yield of 20.09 quintal per hectare. The treatment with 5 per cent NSE @ 2 litre per hectare recorded 28.96, 12.61, 17.71 and 15.18 aphids, jassids, thrips and whiteflies per three leaves, respectively, with the seed cotton yield of 12.31 quintal per hectare. The phytotoxicity studies on leaf injury on tips and leaf surface, wilting, vein necrosis, epinasty and hyponasty showed that there was no phytotoxic effect of the evaluated pesticides on cotton crop at the evaluated doses. The counts on natural enemies in the treatments with hinganbet and ritthaa extract were more or less similar to those recorded in untreated control. This clearly indicated that there was no adverse effects on natural enemies due to spraying of hinganbet and ritthhaa extract at evaluated doses.

Ethnobotanical survey of medicinal plants used as insects repellents in six malaria endemic localities of Cameroon

“…They have membrane-permeabilising, haemolytic, antioxidant, anti-inflammatory, immunostimulant and anticarcinogenic activities, and can affect feed intake, growth and reproduction in animals, and can be used as fungicides, molluscicides and pesticides, as well as against some bacteria and viruses. They can also increase mortality levels, lower food intake, weight reduction, retardation and disturbances in development, and decrease reproduction in insects [ 78 ].…”

Efficacy of Insect Growth Regulators Against Aphids and Thrips on BT Cotton

“…Thumar et al (2018) observed pyriproxyfen 10% EC @ 1000 ml/ ha as effective, whereas, Choudhary and Singh (2015) found three sprays of pyriproxyfen at 10 days interval as effective. Hole et al (2015) and Karkar et al (2014) obtained significant reduction with application of NSKE 5%. Pyriproxyfen 10%EC @ 1300/ 1000 ml; Diflubenzuron 25%WP @ 1314/ 300 gm; NSKE @ 250/ 25 kg; Labour and sprayer charges =2040 Rs/ ha; price of seed cotton Rs.…”

“…Thumar et al (2018) harvested maximum seed cotton yield with pyriproxyfen 10%EC, while Nemade et al (2017) obtained this with buprofezin 25SC. Kalyan et al (2017) also reported the cost effectiveness of buprofezin 25SC, while Hole et al (2015) harvested the satisfactory yield with NSKE 5%.…”

Evaluation of Insect Growth Regulators Against Leafhoppers and Whiteflies in BT Cotton

“…However, Choudhary et al (2015) reported that pyriproxyfen 10EC at different doses proved better than commercial check acetamiprid 20SP @ 20g a.i./ ha and difenthiuron 50WP @ 300g a.i./ ha in harvesting higher yields. Hole et al (2015) recorded seed cotton yield of 12.31 q/ ha in treatment with NSKE 5%.…”