Abstract
The present investigation was carried out during two successive Cabbage seasons (2016-2017 and 2017- 2018), to study the impact of entomopathogenic fungi on Brevicoryne brassica L. The aphid Populations were evaluated in the field early in the season in December 2016 which began to appear on cabbage plants. Thereafter number of aphids increased gradually to reach a peak of abundance during December 2016 & 2017 and January 2017 & 2018). Three concentrations were used (1 x105, 1 x 106 and 1 x 107 spores/ ml.). Under laboratory conditions, the results showed that V. lecanii, M. anisopliae, and B. bassiana have high toxicity and mortality rates occurred after 3rd day from treatment. The maximum percent of mortality (100 %) occurred after the 10th day from treatment with the 3rd concentration in V. lecanii. The 3rd concentration (1 x 107spores/ ml.) was highly toxic in V. lecanii, B. bassiana, and M. anisopliae to the adult of Brevicoryne brassica L. compared with the other two concentrations.Under field conditions, the third concentration (1 x 107) also, was the best concentration against Brevicoryne brassica L. after the third application in V. lecanii, B. bassiana, and M. anisopliae. The percent of reduction was ranged between 93.3 to 99.2% and 92.0 to 97.7 in the high concentrations, in the two seasons, respectively. V. lecanii and B. bassiana were highly effective than M. anisopliae against Brevicoryne brassica L. These results confirmed that V. lecanii, B. bassiana, and M. anisopliae isolates are promising agents for Brevicoryne brassica L. control in the field.
Highlights
Cabbage is the most common vegetable crop grown in Egypt
Three concentrations of three isolates V. lecanii, M. anisopliae, and B. bassiana were evaluated against Brevicoryne brassica L. under laboratory and field conditions
The percent of mortalities ranged between 81.0 to 100, 64.0 to 85.0 and 70.0 to 90.0 % with V. lecanii, M. anisopliae, and B. bassiana, respectively, in the tenth day after treatment. This means that V. lecanii isolation is more effective than M. anisopliae and B. bassiana
Summary
Cabbage is the most common vegetable crop grown in Egypt Lepidopteran pest insects, such as beet webworm, Pyrausta sticticalis, cabbage moth, Mamestra brassicae, diamondback moth, Plutella xyllostella and the large white butterfly, Pieris brassicae, Brevicoryne brassica L. are all able to completely eliminate yield. All these pests are susceptible to formulations based on entomopathogenic bacteria Bt of pathotype A (Cannon, 1996). Occurring entomopathogens are important regulatory factors in insect populations. Fungi are important in the natural regulation of many insect pests and pest populations are often decimated in widespread epizootics (McCoy et al, 1988).
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Schedule a callMore From: Egyptian Academic Journal of Biological Sciences, F. Toxicology & Pest Control
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