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2015 ; 6
(2
): 333-51
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Development of a Microbial-Based Integrated Pest Management Program for
Helicoverpa spp (Lepidoptera: Noctuidae) and Beneficial Insects on Conventional
Cotton Crops in Australia
#MMPMID26463189
Mensah RK
; Young A
; Rood-England L
Insects
2015[Apr]; 6
(2
): 333-51
PMID26463189
show ga
Entomopathogenic fungi, when used as a microbial control agent against cotton
pests, such as Helicoverpa spp., may have the potential to establish and spread
in the environment and to have an impact on both pests and beneficial insects.
Information on the effect of entomopathogenic fungi on pests and beneficial
insects is crucial for a product to be registered as a biopesticide. The effect
of the entomopathogenic fungus BC 639 (Aspergillus sp.) against Helicoverpa spp.
and beneficial insects (mostly predatory insects) was studied in the laboratory
and in cotton field trials. The results show that when Helicoverpa spp. second
instar larvae were exposed to increasing concentrations (from 10² to 10?) of the
entomopathogenic fungus BC 639, the optimum dose required to kill over 50% of the
insects was 1.0 ´ 10? spores/mL. In the field trials, the number of Helicoverpa
spp. per metre on plots treated with 1.0 or 0.50 L/ha of BC 639 was the same as
on plots treated with the recommended rate of the commercial insecticide,
Indoxacarb. However, when plots were treated with 0.25 L/ha of BC 639, this was
not as effective at controlling Helicoverpa spp. as 1.0 or 0.5 L/ha BC 639 or
Indoxacarb. BC 639 had less effect on predatory insects when applied at lower
rates (0.50 and 0.25 L/ha) than at higher rates (1.0 L/ha). Thus, BC 639 was more
selective against predators when applied at lower rates than at the higher rate,
but was also more selective than Indoxacarb. Thus, the ability of BC 639 to
control Helicoverpa spp. effectively with a minimal effect on predatory insects
indicates its potential for enhancing integrated pest management programs and to
sustain cotton production.