Effect of irrigation and spray volume on efficacy of entomopathogenic nematodes (Rhabditida: Heterorhabditidae) against white grubs (Coleoptera: Scarabaeidae)
1994
Downing, A.S.
Infective juveniles of the entomopathogenic nematode Heterorhabditis bacteriophora Poinar (C1 strain) were applied to Kentucky bluegrass (Poa pratensis L.) to determine the effect of irrigation on efficacy against larvae of the japanese beetle, Popillia japonica Newman, and the northern masked chafer, Cyclocephala borealis Arrow. Excellent control (> 80%) was achieved with 1.25-5.0 billion nematodes per hectare when plots received irrigation before treatment application and again within 24 h after treatment application. When plots were not irrigated before treatment, results were inconsistent (range, 0-92% of the control). Two spray volumes (0.16 liters/m(2) and 0.32 liters/m(2) had no significant effect on nematode efficacy.
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