Cyromazine Induced Effects on Larvae and Adults of ... - Iresa

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Mortality (%) 100 80 60 40 20 72 h of exposure Adults Larvae Mortality (%) 100 80 60 40 20 96 h of exposure Adults Larvae 0 0 0 0,05 0,1 0,2 0 0,05 0,1 0,2 Concentration (mg/l) Concentration (mg/l) Fig. 1. Percentage of mortality of C. capitata larvae and adults exposed for various periods of time to different cyromazine doses. Fig. 2. Fecundity of female C. capitata exposed to different cyromazine doses Tunisian Journal of Plant Protection 213 Vol. 5, No. 2, 2010
<strong>Cyromazine</strong> effect on female fecundity. Females exposed to different cyromazine doses exhibited significant reductions in their fecundity (Fig. 2). At the highest dose, the mean number of eggs laid per female was 55 against 200 for the control. Moreover, at this dose, no more eggs were laid after the seventh day after the treatment. At the dose 0.1 mg/l, the mean number of eggs obtained at the third day of laying was 6 and was significantly different from the control. Nevertheless, at the dose 0.05 mg/l, no significant reductions were obtained concerning the mean number of eggs laid per female compared to the control. <strong>Cyromazine</strong> effects on body deformities of larvae and pupae. <strong>Cyromazine</strong> incorporated to second instar larvae diet manifested a poisoning effect expressed by the appearance of body deformities on larvae and pupae. The percentage of deformities was positively correlated to cyromazine doses (Fig. 3). Statistical analyses showed significant differences in percentage of body deformities of larvae and pupae exposed to different doses of the insecticide compared to the control. Fig. 3. Percentage of body malformations of C. capitata larvae and pupae exposed to different cyromazine doses. <strong>Cyromazine</strong> effects on adult emergence rate. Results showed that emergence rate significantly depended on cyromazine dose (Fig. 4). The emergence rate was 2.02% at the dose 0.2 mg/l compared to 2.5% for the dose 0.1 mg/l, while it reached 73.5% at the dose 0.05 mg/l against 83% for the control (0 mg/l). No statistical differences were observed between the control and the lowest dose 0.05 mg/l. Similarly, no statistical differences were obtained between the two doses 0.1 and 0.2 mg/l. Tunisian Journal of Plant Protection 213 Vol. 5, No. 2, 2010
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Cyromazine Induced Effects on Larvae and Adults of ... - Iresa

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