STUDIES ON ZOOPHYTOPHAGY OF Nesidiocoris tenuis (REUTER) (HEMIPTERA: MIRIDAE) ON TOMATO
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2016
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ABSTRACT The present investigation entitled “Studies on zoophytophagy of Nesidiocoris tenuis (Reuter) (Hemiptera: Miridae) on tomato” was carried out under laboratory and glasshouse conditions at Department of Entomology, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan (HP) India during 2013-16. Developmental biology of the bug was significantly influenced by the rearing temperature. Temperature between 20 and 30oC has been found to be ideal for the growth and development of the bug. Low temperature (15°C or below), however, had adverse effect on the growth and development of the bug. N. tenuis required 500 degree-days with developmental threshold of 9°C to complete the development from egg to adult. N. tenuis has been found to be an efficient predator of the greenhouse whitefly, Trialeurodes vaporariorum (Westwood) and the two spotted spider mite, Tetranychus urticae Koch. The bug exhibited Holling’s Type II functional response to T. urticae and showed mutual interference among predator individuals when their density is 2 or more predator per arena of 200 mites. Under glasshouse conditions, N. tenuis at densities of 4-32 bugs/ plant proved effective for the control of T. vaporariorum and T. urticae. As far as the damage potential of the bug on tomato is concerned, N. tenuis caused necrotic rings on leaves and shoots, flower abortion and reduction in fruits per plants, though, the reduction was significant only at bug density beyond 24 nymphs per plant or 16 bugs per plant. The damage potential was further reduced in the presence of the prey i.e. T. vaporariorum and T. urticae. N. tenuis can be successfully multiplied on tomato seedling infested with T. urticae and a bug density of 6/seedling was optimum.
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