DIVERSITY OF SPIDER MITES IN VEGETABLE CROPS WITH SPECIAL REFERENCE TO TWO SPOTTED SPIDER MITE, Tetranychus urticae Koch (ACARI: TETRANYCHIDAE) ON TOMATO
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Date
2018-08-14
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University of Agricultural & Horticultural Sciences, Shivamogga, (COH, MUDIGERE)
Abstract
An investigation was carried out on diversity of spider mites with special reference to Tetranychus urticae Koch, its seasonal incidence and management using acaricides. The experiment was carried out in open field condition during 2017-18 at Department of Entomology, College of Horticulture, Hiriyur, Chitradurga District, Karnataka, India. Three species of Tetranychid mites viz., Tetranychus urticae, T. macfarlanei and T. ludeni were identified from ten different host plants. Among these, T. urticae was reported on tomato, T. macfarlanei was reported on tomato, brinjal, bhendi, cucumber, watermelon, bitter gourd, bottle gourd, soyabean, frech bean and kakachi whereas T. ludeni was recorded on brinjal. During kharif2017, the population of spider mite on tomato was first noticed during the second fortnight of August 2017 and continued up to last week of October 2017. The peak abundance was noticed during the second fortnight of September 2017 with 4.52 mites per leaf. During rabi 2017, the population of T. urticae was first noticed during the second fortnight of December of 2017 with the peak abundance of 38.76 mites per leaf was noticed during first fortnight of March 2018. Among the selected acaricides, fenpyroximate 5 SC was effective at 3, 7 and 10 days after first and second spray against total population of spider mite on tomato under field condition. The least effective acaricide was dicofol 18.5 EC. The order of efficacy of these acaricides against mite population was fenpyroximate 5 SC (1.0 ml/l) > diafenthiuron 50 WP (1.0 g/l) > chlorfenapyr 10 EC (1.0 ml/l) > spiromesifen 22.9 SC (0.8 ml/l) > propargite 57 EC (2 ml/l) > fenazaquin 10 EC (2.5 ml/l) > dicofol 18.5 EC (2.5 ml/l). Finally, the highest yield (69.40 t/ha) and B:C ratio (1: 2.80) was obtained in the treatment fenpyroximate 5 SC.
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