Influence of different cassava cultivars on reproduction and development of Paracoccus marginatus.
In order to pre liminarily investigate the host selectivity mechanism of the invasive pest papaya mealybug(Paracoccus marginatus), the effects of different cassava cultivars on reproduction and development of P.marginatus were studied. The results showed that the effects of cassava cultivars on the development and reproduction of P.marginatus were significant. The average number of oviposition per female was 255, 277 and300, respectively, after feeding on C1115, Swiss F21 and Myanmar, which was significantly lower than that of 341,357 and 370 while feeding on BRA900, SC205 and ZM9066. Besides, the developmental durations from eggs to female and male adults fed on C1115, Swiss F21 and Myanmar were significantly longer than those fed on BRA900, SC205 and ZM9066. The hatchabilities of F1 generation were 85%, 86% and 85%, respectively, which were significantly lower than those of BRA900, ZM9066(100%, 98.5% and 98.5%). In addition, the lifespan of female adults were(4.0±0.5) d,(6.0±1.1) d and(5.5±0.8) d, respectively, which were significantly shorter than those feeding on BRA900, SC205 and ZM9066(10.0±2.1) d,(8.5±1.8) d and(8.0±1.6) d. Moreover, there was no significant difference in female ratios in F1 generation feeding on different cassava varieties. The above results showed that BRA900, SC205 and ZM9066 were suitable for the development and reproduction of P. marginatus, while C1115, Swiss F21 and Myanmar might not be the suitable hosts.