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1 December 2009 Effect of Temperature on the Reproduction of Bracon vulgaris Ashmead (Hymenoptera: Braconidae), a Parasitoid of the Cotton Boll Weevil
Francisco S. Ramalho, Paulo A. Wanderley, José B. Malaquias, Jefferson V. S. Souza, Karjoene C. V. Rodrigues, J. C. Zanuncio
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Abstract

This research studied the effect of temperature on the reproduction of Bracon vulgaris Ashmead (Hymenoptera: Braconidae), an ectoparasitoid of the cotton boll weevil Anthonomus grandis Boheman (Coleoptera: Curculionidae), in climatic chambers, using constant temperatures of 20, 25, and 30°C, relative air humidity of 70 ± 10% and a photophase of 14 h. Females of the parasitoid produced a greater number of eggs when exposed to 25°C (124.65 eggs) in relation to those exposed to 20 (43.40 eggs) and 30°C (49.60 eggs). The mean number of parasitized larvae per female of B. vulgaris at 25°C (71.75) was greater than at 20°C (31.40) and 30°C (25.15). The daily intrinsic rates of increase (rm) were -0.007 at 20°C, 0.07 at 25°C and 0.03 at 30°C, revealing that the temperature of 25°C produced increases of 1,100 and 133% in the value rm in relation to the temperatures of 20 and 30°C, respectively. In programs of biological control of the boll weevil using innoculative releases, adult females of B. vulgaris with approximately five (at 25 or 30°C) or 20 day old (at 20°C) should be used; when using innundative releases, adult females of B. vulgaris, with ages between 11 and 31; 9 and 29 or 3 and 14 days of age, respectively, at 20, 25, or 30°C should be used.

Francisco S. Ramalho, Paulo A. Wanderley, José B. Malaquias, Jefferson V. S. Souza, Karjoene C. V. Rodrigues, and J. C. Zanuncio "Effect of Temperature on the Reproduction of Bracon vulgaris Ashmead (Hymenoptera: Braconidae), a Parasitoid of the Cotton Boll Weevil," Entomological News 120(5), 476-487, (1 December 2009). https://doi.org/10.3157/021.120.0503
Received: 20 June 2008; Accepted: 21 December 2008; Published: 1 December 2009
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KEYWORDS
Anthonomus grandis Boheman
BIOLOGY
Ectoparasitoid
life and fertility tables
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