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dc.contributor.authorReddy, Gadi V. P.
dc.contributor.authorMiller, R. H.
dc.identifier.citationReddy, G. V. P., and R. H. Miller. 2014. Biorational versus conventional insecticides – Comparative field study for managing red spider mite and fruit borer on tomato. Crop Protection 64: 88–92.en_US
dc.description.abstractTomato, Lycopersicum esculentum L. (Solanaceae), is an important crop worldwide that is grown both outdoors and under protected structures, for fresh market consumption and for processing. In the Mariana Islands, tomato is grown as an outdoor crop throughout the year. Tomatoes are attacked by a variety of pests, including the tomato fruitworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), and, in Pacific islands, the red spider mite Tetranychus marianae McGregor. These pests cause scarring, tissue damage, and aberrations in fruit shape or color, making the tomatoes undesirable for fresh market. Also, insect bodies, excretia or parts in fruits reduce their market suitability. Field trials aimed at improving management of these pests were undertaken at two locations in Guam (Yigo and Inarajan), USA in 2012 and 2013, assessing the efficacy of different biorational and conventional insecticides against T. marianae and H. armigera on tomato. At both locations, the mean percentage of mite-infested leaves and the population density of T. marianae were higher in control than in treated plots. An integrated pest management (IPM) program comprising sprays of selective insecticides (Petroleum spray oil, Beauveria bassiana, azadirachtin, and Bacillus thuringiensis), evaluated at 15, 30, 45 and 60 days after transplantation of tomato seedlings, significantly reduced the number of T. marianae-infested leaves and the density of T. marianae over plots treated with carbaryl, malathion, six applications of B. bassiana or B. thuringiensis and over both controls at both locations. Similarly, significantly lower fruit damage by H. armigera was recorded in the plots treated with the IPM program than in plots treated with carbaryl, malathion, or the control treatments at both locations. Marketable tomato yields from the plots which received with the IPM program were significantly greater at both locations than were those in the other treatments.en_US
dc.description.sponsorshipThis project was supported initially by FY 2011 USDA's Pest Management Alternatives Program (PMAP), and the Grant Award No 2011-34381-30732 Special Research Grants Program - Competitive to the University of Guam. This project was transferred to the Montana State University (Grant Award No 2011-34381-20051) under Project Director Transfer from the University of Guam. The USDA is an equal opportunity provider and employer. We thank Mr. R. Gumataotao for his help in the field.en_US
dc.titleBiorational versus conventional insecticides – Comparative field study for managing red spider mite and fruit borer on tomatoen_US
mus.citation.journaltitleCrop Protectionen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentResearch Centers.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupWestern Triangle Ag Research Center.en_US

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