E. Vinuela et al., DIFFERENTIAL LARVAL AGE SUSCEPTIBILITY OF THE MEDFLY, CERATITIS-CAPITATA WIED (DIPT, TEPHRITIDAE) TO CYROMAZINE, Journal of applied entomology, 115(4), 1993, pp. 355-362
Ceratitis capitata Wied. larvae reared on an artificial diet supplemen
ted with a range of concentrations of the IGI cyromazine, suffered sev
ere developmental disruption depending on larval age. 100% mortality w
as recorded when young larvae (1- and 2-day-old) were exposed to a 10
mg/kg cyromazine-treated diet, whereas later-stage larvae (6- to 9-day
old larvae; L6 to L9) were able to pupate with 25 to 100 mg/kg concen
trations. Moreover the adult emergence rate was severely affected in t
hese cases (less than 7 % for L6 to LS, and just 36% for L9). Larval m
obility (measured as popped pupae) was drastically reduced except for
L9. A significant larval growth inhibition at 3 days was observed in L
2, L4 and L6, in a dependent dose manner: the median inhibitory concen
tration being near 1 mg/kg for young larvae, but reaching 100 mg/kg fo
r the older ones.