A Comparison Between Two Species of Nematode (Steinernema carpocapsae and Steinernema feltiae) Applied through a Foliar Spray to Control Leafminer (Liriomyza trifolii) in Dendranthema grandiflora

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  • 1 California Polytechnic State Univ., Environmental Horticultural Science, San Luis Obispo, CA 93407
  • | 2 California Polytechnic State Univ., Environmental Horticultural Science, San Luis Obispo, CA 93407

The use of beneficial nematodes as part of integrated pest management strategies is increasing especially for the control of soil inhabiting arthropods, however few studies have been published evaluating the efficacy of foliar applications for control of leafminer (Liriomyza trifolii). The objective of this study was to determine the more effective species of commonly used Steinernema (S. carpocapsae, S. feltiae) in the control of leafminer (Liriomyza trifolii). Greenhouse cut flower stocks of Dendranthema grandiflora grown in raised beds were infected with a well-established population of L. trifolii. Plants were treated with a coarse aqueous spray containing commercial preparations of each of the two nematode species at a rate of 1 million nematodes/5 square meters and a water control. Treatments were replicated three times in a randomized block design. Two days after treatment, larvae of L. trifolii were removed from the leaves and examined for parasitism.

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