Efficacy of fungus Lecanicillium lecanii (Zimmerman) Zare & Gams on the population of green-peach aphid, Myzus persicae (Sulzer)

Mousavi, Monireh and Nouri Ganbalani, G. and Rafiee-Dantjerdi, H. and Zargarzadeh, F. (2010) Efficacy of fungus Lecanicillium lecanii (Zimmerman) Zare & Gams on the population of green-peach aphid, Myzus persicae (Sulzer). Other thesis, University of Mohaghegh Ardabili.

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Abstract

In this research the controlling effect of Lecanicillium lecanii (Zimmerman) Zare & Gams with the trade name of Vercani on Mysus persicae (Sulzer) (on potato) and M. persicae (on rape seed) and Aphis gossypii (Glover) (on cucumber) was studied under controlled conditions (22±2Ċ, 100%RH & 16:8L/D) in the laboratory. For experiment five different aqueous conidial concentrations were prepared on the basis of the logarithmic distances in sterile distilled water. The pathogen was multiplied by the standard method and five different doses of (104, 105, 106, 107, 108spore /ml) and a control were prepared as treatments. The experiments were conducted on a factorial design with six replication on CRD basis. For each replicate, 10 adult of M. persicae (on potato and rape seed) and A. gossypii (on cucumber) were treated by spraying with 10 ml of conidial suspensions with various treatment and in disposable plastic petri plates containing water agar 1% and disinfected fresh potato, rape seed and cucumber leaves. Dishes were checked daily and the number of dead aphids were counted and recorded and potato, rape seed and cucumber leaves were replaced. The mortality count was continued for 5 days. Analysis of variance of data showed that mortalities due to fungal infections 5 days after treatment were 100% for all treatments and with increased concentrations the time required for complete mortality of insects was reduced. LT50 of M. persicae (on potato and rape seed) and A. gossypii (on cucumber) in 104 spore /ml concentration were 1.61, 2.46, 2.81 days respectively and in 107 spore /ml concentration were 1.17, 1.53, 2.17 days respectively. So LC50 product on insect of M. persicae (on potato & rape seed) and A. gossypii (on cucumber) for 48 hour were 1.11, 5.62, 7.71 spore /ml respectively. Lower LT50 and LC50 means higher effects of. Thus, L. lecanii on M. persicae (on potato) has more controlling effect than M. persicae (on rape seed) and A. gossypii (on cucumber) and so controlling effect of fungi on M. persicae is more than A. gossypii.

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