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Evaluation of entomopathogenic fungus Metarhizium anisopliae against soil-dwelling stages of cabbage maggot (Diptera : Anthomyiidae) in glasshouse and field experiments and effect of fungicides on fungal activity

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UNSPECIFIED (2005) Evaluation of entomopathogenic fungus Metarhizium anisopliae against soil-dwelling stages of cabbage maggot (Diptera : Anthomyiidae) in glasshouse and field experiments and effect of fungicides on fungal activity. JOURNAL OF ECONOMIC ENTOMOLOGY, 98 (6). pp. 1856-1862. ISSN 0022-0493.

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Abstract

The effect of two isolates of the entomopathogenic fungus Metarhizium anisopliae (Metchnikoff) Sorokin (389.93 and 392.93) on root-feeding stages of cabbage root fly, Delia radicum (L.), was studied under glasshouse and field conditions. In glasshouse studies, the effect of drenching a suspension of conidia (concentration I X 10(8) ml(-1), 40 ml per plant, applied on four occasions) onto the base of cabbage plants infested with D. radicum eggs was compared with mixing conidial suspension into compost modules (concentration I X 10(8) ml(-1), 25 ml per plant) used to raise seedlings. Drench application reduced the mean number of larvae and pupae recovered per plant by up to 90%, but the compost module treatment had no statistically significant effect. Both application methods reduced the emergence of adult flies from pupae by up to 92%. Most conidia applied as a drench application remained in the top 10-cm layer of compost. Applications of the fungicides iprodione and tebuconazole, which are used routinely on brassica crops, were compatible with using M. anisopliae 389.93 against D. radicum under glasshouse conditions, even though these fungicides were inhibitory to fungal growth on SDA medium. In a field experiment, drench applications of M. anisopliae 389.93 to the base of cauliflower plants at concentrations of 1 X 10(6) to I X 10(8) conidia ml(-1) did not control D. radicum populations, although up to 30% of larval cadavers recovered supported sporulating mycelium. Drench applications often exhibited considerable lateral movement on the soil surface before penetrating the ground, which may have reduced the amount of inoculum in contact with D. radicum larvae.

Item Type: Journal Article
Subjects: Q Science > QL Zoology
Journal or Publication Title: JOURNAL OF ECONOMIC ENTOMOLOGY
Publisher: ENTOMOLOGICAL SOCIETY AMERICA
ISSN: 0022-0493
Official Date: December 2005
Dates:
DateEvent
December 2005UNSPECIFIED
Volume: 98
Number: 6
Number of Pages: 7
Page Range: pp. 1856-1862
Publication Status: Published

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