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1 May 2005 Biology and Biometry of Sharpshooter Homalodisca coagulata (Homoptera: Cicadellidae) Reared on Cowpea
Mamoudou Sétamou, Walker A. Jones
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Stage-specific survival, growth, developmental biology, and biometry of the sharpshooter Homalodisca coagulata (Say) were studied in the laboratory under controlled conditions of 27 ± 1°C, 65 ± 5 RH, and a photoperiod of 14:10 (L:D) h. Nymphs and adults were individually reared on excised cowpea, Vigna unguiculata L. Walp., plants maintained in floral aquapics containing a hydroponic solution. Embryonic development of eggs was completed in 7.1 ± 0.8 d with 92.6% of the incubated eggs hatching. Nymphs molted five times, and the nymphal period of 61 ± 2.9 d for females was 1.2-fold significantly longer than that of males. The second nymphal stage was the shortest for both sexes (6.1 ± 0.5 d for females and 5.8 ± 0.8 d for males), whereas the last instar was the longest for females only. Stage-specific mortality was similar between instars; ≈36% of the nymphs molted to adults. H. coagulata adult sex ratio was not significantly different from a 1:1 ratio. Adult females lived 52 ± 11 d, and females deposited an average of 194 ± 35 eggs each. Analysis of life table statistics indicated that populations of H. coagulata increased at a rate of 1.045 per day and doubled within 15.6 d. The different H. coagulata growth stages were well described by body length, head capsule width, and hind tibia length; however, analysis of frequency distribution showed that head capsule width was the most suitable parameter for distinguishing the immature developmental stages of H. coagulata.

Mamoudou Sétamou and Walker A. Jones "Biology and Biometry of Sharpshooter Homalodisca coagulata (Homoptera: Cicadellidae) Reared on Cowpea," Annals of the Entomological Society of America 98(3), 322-328, (1 May 2005).[0322:BABOSH]2.0.CO;2
Received: 28 October 2004; Accepted: 1 December 2004; Published: 1 May 2005

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biometric data
developmental biology
Homalodisca coagulata
Life table parameters
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