Application rate and timing, potting medium, and host plant effects on the efficacy of Steinernema feltiae against the fungus gnat, Bradysia coprophila, in floriculture

被引:36
作者
Jagdale, GB [1 ]
Casey, ML [1 ]
Grewal, PS [1 ]
Lindquist, RK [1 ]
机构
[1] Ohio State Univ, Ohio Agr Res & Dev Ctr, Dept Entomol, Wooster, OH 44691 USA
关键词
Bradysia coprophila; entomopathogenic nematode; Euphorbia pulcherrima; fungus gnats; impatiens; Impatiens hawkeri; poinsettia; potting media; Steinernema feltiae;
D O I
10.1016/S1049-9644(03)00164-6
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Effects of three nematode concentrations, five application timings, four potting media, and two host plants on the efficacy of Steinernema feltiae against the fungus gnat, Bradysia coprophila, were studied in the greenhouse and growth chamber experiments. In New Guinea impatiens (Impatiens hawkeri), application rates of 1.25 and 2.5 x 10(5) infective juveniles/m(2) of S. feltiae equally and significantly reduced the population of fungus gnats relative to the control but in poinsettia (Euphorbia pulcherrima), 2.5 and 5 x 105 infective juveniles/m(2) produced similar reductions. Nematode efficacy against the fungus gnats was significantly lower in the nursery-mix as compared with Ball-mix, Metro-mix, and Pro-mix potting media. Nursery-mix was also favorable to fungus gnat colonization and had the highest infestation. Application of S. feltiae to the Metro-mix and Pro-mix significantly reduced B. coprophila emergence relative to the control 7 days after treatment but in the Ball-mix it took 14 days. In all the four media, poinsettia supported significantly higher numbers of fungus gnats than the impatiens but nematode efficacy was higher in the impatiens. Application timing affected the efficacy of S. feltiae against fungus gnats infesting poinsettia but not impatiens. In the growth chamber, only application 16 days post-transplanting significantly suppressed the fungus gnat emergence as early as 31 days after treatment and remained significant throughout the experiment but all other application timings (0-8 days post-transplanting) suppressed the fungus gnat emergence only after 75 days. In the greenhouse, all four application timings significantly suppressed the fungus gnats on poinsettia relative to the control 34 days after treatment. We conclude that nematode application rate and timing, potting medium, and host plant are all important factors in the control of fungus gnats with entomopathogenic nematodes. (C) 2003 Elsevier Inc. All rights reserved.
引用
收藏
页码:296 / 305
页数:10
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