SYNTHETIC PYRETHROID INDUCED COTTON PLANT LEAF TISSUE MORPHOLOGICAL CHANGES AND INCIDENCE OF BEMISIA TABACI
Mar 13, 2017

Crop Protection WCRC Croprotection-Asia WCRC1
Abstract                                                                         Back to Table of contents

Trials were conducted during the 1989 and 1990 cotton growing seasons at Parbhani, Maharashtra State, India to study the impact of synthetic pyrethroids on the incidence of the whitefly, Bemisia tabaci (Gennadius).  Treatments consisted of:  (1) five applications of cypermethrin 0.0075%; (2) five applications of fenvalerate 0.016%; (3) five applications of cypermethrin 0.0075% + dimethoate 0.03%; (4) three applications of cypermethrin 0.0075% alternated with two applications of monocrotophos 0.06%; (5) three applications of fenvalerate 0.016% alternated with two applications of monocrotophos 0.06%.  Whitefly adult populations were significantly higher in cypermethrin and fenvalerate treated plots compared to untreated cotton plots.  The leaf anatomical studies indicated a reduction in the thickness of the palisade layer and a change in the cellular pattern of the mesophyll tissue layer.  The data provided a possible reason for higher whitefly adult populations in the synthetic pyrethroid treated plots.

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