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Effect of pesticides on the population dynamics of Green lacewing (Chrysoperla carnea) and Ladybird beetle (Coccinella septempunctata) under field condition of okra

. Asif Ullah Khan1, Izhar Ul Haq2, Riaz Hussain3*, Aamir Abbas4, Muhammad Hamid Nawaz Khan5, Aamir Riaz5, Shabeer Ahmad6, Muhammad Kiramat Shah2, Suliman Khan7, Mehboob Ali7, Shah Saud8, Kumail Khan9, Hamra Ali10, Hamza Iftikhar9, Shahab Ahmad11


Abstract

Natural enemies play very important role in the reduction of insect pest populations. Pesticides are measured the first line of protection for the control of pests. At least in the short and moderate term, the consumption of pesticides will remain a vital strategy for pest management, allowing growers to yield of the crops of sufficient quality at low costs. Integrated Pest Management (IPM) as well known approach combines several different pest-control tactics, among the chemical and biological control stands out. The current experiment was conducted to find out the effect of different pesticides on the population of natural enemies of major insect pest of okra. The experiment was Randomized Complete Block Design (RCBD) with three replications and eight treatments along with control. Different pesticides used in the experiment i.e Garlic extract, Lemon grass extract, Tobacco extracts, Neem extracts,  Onion extract, Pyriproxyfen 10.8% EC,  Imidacloprid 25% WP. The highest mean population of ladybird beetle was recorded in control plot (2.97) and followed by garlic extract, Tobacco extract, Neem extract, Lemon grass extract (2.23, 1.93, 1.93 and 1.80 respectively) which was nonsignificant. The lowest mean population of ladybird beetle was observed in plot treated with Imidacloprid and Pyriproxyfen (0.90 and 1.03 respectively). The highest mean population of Green lacewing was recorded in control plot (2.34), followed by Garlic extract Neem extract Tobacco extract Lemon grass extract and Onion extract (1.81, 1.73, 1.66, 1.58, 1.57 respectively). While lowest mean population of Green lacewing was recorded in plot treated with Imidacloprid and Pyriproxyfen (0.73, 0.82 respectively). It is concluded from the experiment that chemical insecticides Imidacloprid and Pyriproxyfen are more hazardous to natural enemies of major insect pests of okra. Plant extracts can be recommended because it is ecofriendly management of many insect pests and their natural enemies.

Key words. Chemicals, Plant extracts, Okra and natural enemies.

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