Abstract
Entomopathogenic fungi can be ideal for the biocontrol of cockroaches since it is environment-friendly microbial pesticide. Susceptibility of second and fourth instar of nymphs and adults of the brown banded cockroach, Supella longipalpa (F.) (Blattodea: Blattellidae) to the entomopathogenic fungi Beauveria bassiana (Bals.) Vuill. at two concentrations 1x 107 and 1x 108 spore/ml was evaluated. Fungus was tested by using two different methods: bait and direct contact. Mortality was monitored after 3, 5 and 7 days’ post exposure. Direct contact of B. bassiana at concentration 1x 107 spore/ml produced mortality on adults 82.76% and for fourth and second instar of nymphs 82.76 and 93.10% after 7 days’ post treatment, respectively. When S. longipalpa was exposed to bait with B. bassiana the mortality percentage was 37.93% for the adults, and caused 64.29 and 58.62% mortality to the second and fourth instar of nymphs, after 7 days from treatment, respectively. Nymphs and adults of S. longipalpa treated by direct contact with B. bassiana at 1x 108 spore/ml, produced mortality on adults, fourth and second instar of nymphs 78.57, 93.10 and100% after 7 days’ post treatment, respectively. Method of bait the mortality for adults, fourth and second instar of nymphs were 51.72, 72.41 and 78.57% after 7 days’ post treatment, respectively. Results showed differences in susceptibility between nymphs and adults of S. longipalpa. Adult and nymph instars (fourth and second) mortalities due to direct contact by B. bassiana suspension (1x 107 and 1x 108 spore/ml) produce high mortalities (53.51, 93.10, 82.76% and 78.57, 100, 93.10%) respectively.
Highlights
Cockroaches have for some time been known as vectors of nourishment harming and irresistible living beings [1,2,3]
Table (2) shows the highest mortality rate was the second instar of the nymphs and reached 64.29 % after 7 days for the treatment of baits mixed with bran wheat flour proportion weight / volume mean 1 gm/ ml of a suspension containing 1x107 spore per milliliter of B. bassiana, and 4 gm of this mixture was applied, the lowest mortality rate was 53.57% after 3 days of exposure to bait for the same instar nymphs
Our results of treatment with direct contact did not agree with results recorded by [21] which M. anisopliae Iran 437C had a high virulence against S. longipalpa adult and nymph mortality were 52.5 and 45% treated with 6.6×105 conidia/cm2, at concentrations of M. anisopliae 1.65×107 and 6.6×107 conidia/cm2, adult and nymph mortality were 100 %, after 7 days of exposure, respectively
Summary
Cockroaches have for some time been known as vectors of nourishment harming and irresistible living beings [1,2,3]. It is currently appropriated all through tropical and subtropical areas of the world [1] This cockroach species conveys an assortment of microorganisms, as a vector for pathogenic microscopic organisms in urban situations and it has likewise been accounted for as a wellspring of allergens [3, 5, 6]. Bountiful mycosis creates on the bodies of the creepy crawlies that have kicked the bucket because of parasitic disease These mycotic corpses propagate the deadly parasitic contamination in the creepy crawly populace Hyphomycetes growths have been accounted for to contaminate cockroaches [11,12,13]. The overall objective of the present study was to evaluate differential susceptibility of nymphs and adults of S. longipalpa to entomopathogenic fungi B. bassiana comparing between direct contact and bait treatment methods
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