Abstract
The reproductive potential and longevity of 20 adult females of Catolaccus grandis (Burks), an introduced parasitoid of the cotton boll weevil, were determined under laboratory conditions at constant 30 ± 1°C. The resulting data were used to calculate life tables and estimate rate of increase. The number of larval instars and the duration of stadia of C. grandis were also determined by marking the cuticle with a dye to identify the change of instar. C. grandis females ( n = 20) produced 498.8 ± 108.3 eggs, parasitized 236 ± 45.8 boll weevil larvae, and had a longevity of 46.4 ± 12.2 d. The daily oviposition rate ranged from 0.13 to 23.9 eggs per day depending on the age of the female. The net reproductive rate ( R o) was 28.3, the daily intrinsic rate of increase ( R m) was 0.159, and the weekly rate of increase was 1.33 at 30°C. The mean developmental time of the egg was 1.5 ± 0.3 d. Five larval instars were identified with durations of 23.6 h, 12.9 h, 14.1 h, 13.3 h, and 66.6 h in males and 29.0 h, 10.0 h, 14.0 h, 14.0 h, and 91.0 h in females. The total developmental time for the larval stage was 5.4 ± 0.6 d for males and 6.6 ± 1.1 d for females. The pupal stage required 4.8 ± 0.2 d in males and 5.3 ± 0.3 d in females. The total mean developmental time was 11.9 ± 0.8 d for males and 13.3 ± 1.2 d for females.
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