Influence of aphid herbivory on the photosynthetic parameters of Brassica campestris at multan, Punjab, Pakistan

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Research Paper 01/07/2014
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Influence of aphid herbivory on the photosynthetic parameters of Brassica campestris at multan, Punjab, Pakistan

Arjad Hussain, Muhammad Razaq, Waseem Shahzad, Khalid Mahmood, Fawad Zafar Ahmad Khan
J. Bio. Env. Sci.5( 1), 410-416, July 2014.
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Abstract

Two of the regular insect pests, Brevicoryne brassicae and Lipahis eyrsimi attack on the Brassica campestris varieties throughout the growing season at Multan, Southern Punjab, Pakistan. Effect of these aphid species were examined on photosynthesis Brassica campestris cultivars, B. campestris A, Toria selection A, B. campestris PARC and B. campestris local under three different insecticide treatments, under RCBD design following split plot experiment in 2012. Populations of both the aphid species imposed their attack up to the mid of March in unsprayed and one spray treated plots respectively. Aphid herbivory caused significant reduction in photosynthetic rate and water use efficiency. Aphid free and single application of insecticide at peak flowering stage resulted in significant increase in photosynthetic rate and water use efficiency. The necessary practice of insecticide should be performed at the critical stage (peak flowering) of plant to optimize the photosynthesis losses and overcome the hazardous use of insecticides with least effect on the natural ecosystem.

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