Comparative efficacy of neem oil and lambdacyhalothrin against whitefly (Bemesia tabaci) and jassid (Amrasca Devastans Dist.) in okra field

Abstract

The present study was conducted to investigate the comparative efficacy of neem leaf extracts and lambdacyhalothrin against whitefly and jassid in okra field. Four okra cultivars (SABZ PARI, SADA BAHAR, PUS A SAWANI, ARKA and ANAMIKA) were grown in field with four replication. Five neem oil concentra tions (1, 2, 3, 4 and 5 percent) and a synthetic insecticide (Lambdacyhalothrin 2.5EC) @ 330 mL acre -1 were applied to evaluate efficacy effects on targeted insects population. Distilled water was used as control. The plots treated with synthetic insecticide and the leaf extracts against targeted pests had significantly (P < 0.05) sup pressed insect population as compared to control. After 1st spray, no significant (P < 0.05) reduction in pest pop ulations were observed after 24 hours. However, significant (P < 0.05) reduction in population was recorded after 48 and 72 hours respectively. The decline in efficacy of insecticides were recorded after 360 hours of spray. Lamb dacyhalothrin and neem oil @ 4 and 5% concentration were equally effective against whitefly and jassid feeding on okra plants. The efficacious effect of neem oil and synthetic insecticide on plant height, number of pods/plant and yield were also studied. Furthermore, tested treatments had no significant effect on plant height and yield parameter (number of fruits pods plant -1 ). Whereas, tested treatments of neem oil @ 4 and 5% and lambdacyhalothrin had induce significantly (P < 0.05) impact on yield parameter (yield). We conclude that Lambdacyhalothrin and neem oil @ 4 and 5% concentration are equally effective in controlling jassid and have same impact on yield of okra plant.

Comparative Toxicity of Nitenpyrem and Neem Oil Against Amrasca biguttula biguttula in Okra

“…All tested concentrations were found toxic against jassid as compared to control. The study findings are in line with the results reported by previous workers (Rehman et al, 2015). The application of botanical extracts and chemical insecticides can influence insect pest population and total fruit weight (Ali et al, 2005;Indira Gandhi et al, 2006).…”

“…For this purpose, six plants were randomly selected from the central two rows in each treatment and upper, middle and lower leaves of selected plants were examined to count pest population. Mean and percent reduction of pest population was calculated according to Rehman et al (2015).…”

Insecticidal Potential of Homemade Neem Extract Against Jassid <i>Amrasca biguttula biguttula</i> (Ishida) Infesting Okra

“…These findings are in accordance with those of Aziz et al (2019) with foliar applications of 2% neem seed extract. Hafeez et al (2015) observed that application of neem leaf extracts (neem oil) @ 4 & 5 % and lamdacyhalothrin @ 825 ml/ ha significantly decreased whitefly and jassid. Nderitu et al (2008) compared the efficacy of soil application of neem cake @ 200 kg/ ha with foliar application of neem seed kernel extract, neem oil, Amrutguard, neem leaf decoction etc., and observed that the integrated neem cake treatments plus endosulfan and chlorpyriphos performed better.…”

Sustainable Management for Spiralling Whitefly, Aleurodicus dispersus Russell (Hemiptera: Aleyrodidae) Infesting Guava and Its Effects on the Natural Enemies’ Complex

“…Previous reports showed that application of neem oil reduced the nymphal population of spiralling whitefly up to 91.7% in guava (Dubey and Sundararaj, 2004). Ur-Rehman et al (2015) found that applying neem oil reduced the silver leaf whitefly's (B. tabaci) population by up to 70.77% in okra (Abelmoschus esculentus). Neem oil serves as an insect antifeedant because of azadirachtin, which affects the normal digestive process of insects (Adhikari et al, 2020).…”