Annals of the Entomological Society of America (1997) 90, 631-639

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Matthew Hentz, Peter Ellsworth and Steven Naranjo (1997)
Biology and morphology of Chelonus sp. nr. curvimaculatus (Hymenoptera: Braconidae) as a parasitoid of Pectinophora gossypiella (Lepidoptera: Gelechiidae)
Annals of the Entomological Society of America 90 (5), 631-639
Abstract: A general description of the life stages of Chelonus sp. nr. curvimaculatus, an egg-larval parasitoid of pink bollworm, Pectinophora gossypiella (Saunders), is presented. Pink bollworms were reared in the laboratory on a wheat germ diet. At 29°C, parasitoid eggs (0.12-0.18 mm) begin to eclose ~22 h after oviposition. Three instars occur in this species. The 1st instar is endoparasitic and ranged in length from 0.14 mm (neonate) to 1.25 mm (~9 d old, end of the 1st stadium). The 2nd instar also is endoparasitic and is 1.89-3.04 mm long. This stadium lasts ~2-3 d. The 3rd instar is an average of 3.82 mm long and is endoparasitic early in its development but becomes ectoparasitic toward the completion of its development. This stadium lasts ~3 d. The pupal stage lasts ~ 6-7 d. Adult parasitoids begin to emerge ~21 d after oviposition. Parasitized and unparasitized pink bollworm larvae developed through 4 stadia. Larval head capsule widths, body lengths, and weights of parasitized pink bollworms are significantly smaller than those of unparasitized larvae during the 3rd and 4th stadia. Parasitized 4th-instar pink bollworms have a mean head width of 0.8687 mm, body length of 6.28 mm, and weight of 6.9 mg. Fourth-instar unparasitized pink bollworm measurements were 1.0743 mm, 9.31 mm, and 17.7 mg, respectively.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Steven E. Naranjo, Peter C. Ellsworth

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Pectinophora gossypiella