Host Plant Associations of Two Karyotypic Forms of Anthonomus grandis Boheman

James R. Cat and David T. North


 
ABSTRACT

Boll weevils, Anthonomus grandis Boheman, were obtained from known host plants in the United States and Mexico and shipped to Fargo, North Dakota for cytolo gical examination. Infested flower buds and fruit were collected in Mexico and held at cool temperatures for a maximum of six days until they could be transported to Fargo. Weevils were allowed to emerge in quarantine at the Metabolism and Radiation Research Laboratory. Emerging weevils were isolated in individual vials and fed either cotton flower buds or artificial boll weevil diet. At 3 to 30 days of age the testes were removed from the males, treated with colchicine, stained and fixed and mounted on slides. Karyotype was determined from mitotic and meiotic chromosomes of the spermatogonial cells.

The results show that all collections from Hampea nutricia Fryxell near Cardenas Tabasco and Pozo Rica, Veracruz and H. latifolia Standley at Tapachula Chiapas have 22 pairs of chromosomes. Collections from Cienfuegosia rosei Fryxell at Tehuantepec, Oaxaca, Hibscus tilliaceus Linnaeus at Tapachula, Chiapas, wild cotton at Sisal and Progresso, Yucatan, Escarcega, Campeche, and Tehuantepec, Oaxaca and cultivated cotton at Tapachula, Chiapas and the South eastern United States have 21 pairs of chromosomes. These two genetically distinguishable forms of A. grandis are inseparable morphologically. Colleitions Trom-Arizona and Northern Sonora are not adequate to characterize the karyotype of weevils in Arizona and Northern Sonora, but existing data show that most populations are a mixture of 21 and 22 chromosome forms.



Reprinted from Proceedings of the 1983 Beltwide Cotton Production Research Conference pg. 174
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998