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Insect Pest Management of Vegetable Crops Using different Eco-friendly Pesticides in Kathmandu Valley
Suman Gajurel

Last modified: 2017-07-20

Abstract


The study was focused on management of insect pest of cauliflower using ecofriendly pesticides and the survey was conducted in commercially cauliflower growing farms of Kathmandu, Lalitpur and Bhaktapur district during October, 2016. A household survey was conducted with the random sampling method and interviewed with semi-structured questionnaire to assess the status of eco-friendly pesticides. It was found that, among 50 respondents, the major technical constraint was insect problem in cauliflower and broccoli followed by diseases, irrigation and technology. It was also found that majority of the farmers used chemical pesticides in vegetable crops for the management of insect pests. Overuse and misuse of chemical pesticides has developed resistance and results in increasing insect’s population. Diamondback moth was found to be a major pest. Even the farmers were well known about botanical pesticide but they were not practicing it because of unavailability of botanical plants.

The field experiment was also conducted to assess the efficacy of different botanicals against insect pest of cauliflower. Experimental plot was designed in Randomized Complete Block Design (RCBD) under five treatments and 4 replications. The treatments were homemade bio-fertilizer (T1), Gitimal (T2), Bajura pesticide (T3), Cow urine (T4) and Control (T5). From the experiment it was found that homemade bio-fertilizer has causes more impact on height of plant (25.09 ± 10.71) and number of leaves (11.75 ± 1.95). Similar trend of impact was revealed in Canopy of cauliflower crops with the application of Gitimal (29.59 ± 9.41) and Homemade bio-fertilizer (29.39 ± 12.9). Bajura pesticides showed highest reduction of insect pest population after first spray (7 DAT = 85.82 %, 14 DAT = 66.35), second spray (7 DAT = 93.92 %, 14 DAT = 74.03%) and third spray (7 DAT = 96.71%, 14 DAT = 92.70%).

Similarly, another field experiment was carried out with the different concentration of Bajura pesticide to assess the appropriate dose of pesticide to apply in RCBD with 5 treatments and 4 replications. Treatments were in concentration of 1:5 and 1:10 which were sprayed in 7 days and 14 days interval which were indicated as 1:5 at 7 days (T1), 1:5 at 14 days (T2), 1:10 at 7 days (T3), 1:10 at 14 days (T4) and control (T5). 1:10 at 7 days was found more effective against the health of plant and in terms of insect pest population reduction compared with other treatment. Our study focuses on the formulation and use of ecofriendly pesticides.

 


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