Different radiation times of microwave ray could stimulate development of Callosobruchus maculatus (Col.: Chrysomelidae) under laboratory conditions

عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
Successful production of legume cropping systems is restricted due to the incidence of several insect pests such as cowpea seed beetle, Callosobruchus maculatus (F.). This species is a cosmopolitan field-to-store pest and considered as the one of the main postharvest pest of different legumes of Vigna spp. in storage. In the present study, effects of different radiation times of microwave ray (0, 10, 30, 50, 70, 90, 130 and 170 seconds) was investigated on biological traits of C. maculatus under laboratory conditions at 25°C, photoperiod of 16L: 8D h. and relative humidity of 65%. Data analysis was performed using age-stage two sex life table theory and the means, variances and standard errors of the biological parameters were estimated using the bootstrap resampling procedure. The results confirmed that different treatments had significant effects on biological parameters of C. maculatus. Accordingly, duration of total immature stages of the pest was significantly affected and lasted 38.32, 38.30, 37.81, 38.65, 38.25, 36.39, 35.13 and 35.16 days, respectively. Mortality of immature stages was also significantly altered and the highest and lowest estimated values were 48 and 22% at 50 and 130 seconds of radiation, respectively. As a noticeable point, our results revealed that lower radiation times of microwave ray could stimulate reproduction of C. maculatus. The highest recorded value for net reproductive rate (R0) at 90 seconds of radiation was 29.85 offspring. This parameter had the lowest value at control (11.07 offspring). The intrinsic rate of increase (r) was 0.053, 0.055, 0.057, 0.060, 0.076, 0.079, 0.080 and 0.071 (day-1), respectively. These findings showed that lower radiation times of microwave ray (up to 130 seconds) had stimulating effects on potential of population increase of C. maculatus. The calculated values for finite rate of increase (λ) were increased (1.054, 1.056, 1.058, 1.062, 1.079, 1.083, 1.083 and 1.074 day-1, respectively) as radiation time (up to 130 seconds) was increased. The results of the present study can be used for further assessment of radiation as a means to control C. maculatus.
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