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Development of a model for mass production of Neoseiulus longispinosus, a phytoseiid predator of spider mites

Authors:

G. G. Jayasinghe ,

Department of Export Agriculture, Thihagoda, LK
About G. G.
National Cinnamon Research & Training Center
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B. Mallik

University of Agricultural Sciences, GKVK, Bangalore, IN
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Abstract

The two spotted spider mite (Tetranychus urticae Koch.) is a serious pest in greenhouses as well as on field grown crops. The predatory mites are important in regulating spider mite populations and should be conserved whenever possible due to their great predatory potential. The pyhtoseiid predator Neoseiulus (Amblyseius) longispinosus (Evans) has a wide distribution and has the ability to adapt to warm temperature inside poly houses under South Indian conditions. This study was undertaken to develop an efficient mass multiplication model for N. longispinosus. To determine the highest yield of predatory mite N. lonigispinosus, both the prey (T. urticae; 5 and 10 per leaflet) and predator mites (2 and 4 per leaflet) were released at two different ratio on French bean (FB) plants at four different growth stages as a tri trophic system. The treatments were imposed with three replicates in a factorial arrangement. Prey mites were released at 20, 25, 30 and 35 days after sowing (DAS) and predatory mites were released 10 days after prey mite release. The number of eggs, immature stages and adults of spider mites as well as predatory mites in each sample was recorded from 35 DAS. Two models where ten spider mites were released per leaflet on 20 DAS with 2 and 4 predatory mites released at 30 DAS, and the third model where release of spider mites at 25 DAS with two predators per leaflet were released, gave the highest yields of the predator. The first model was the most suitable, where the predators harvested was 1,087,130 (55 DAS), 1,362,600 (60 DAS) and 2,000,700 (65 DAS) per 300 pots, at a cost of production of Indian Rupees (INR) 7.5, 6.4 and 4.63 for 1000 predators, respectively. When four predators were used in the above model, 146,230, 325,840, 700,110 and 1,083,700 predators were harvested per 300 pots in 35, 40, 45 and 50 DAS, respectively. The costs of the 1000 predators were INR 40.39, 19.85, 10.04 and 7, respectively. The present models were based on two repeated cycles (two times) and the information generated may be insufficient to draw a solid conclusion. Hence, these models need to be tested thoroughly to stabilize predator production.
How to Cite: Jayasinghe, G.G. & Mallik, B., (2015). Development of a model for mass production of Neoseiulus longispinosus, a phytoseiid predator of spider mites. Sri Lanka Journal of Food and Agriculture. 1(2), pp.15–21. DOI: http://doi.org/10.4038/sljfa.v1i2.15
Published on 12 Sep 2015.
Peer Reviewed

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