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Larval Development and Survival of The Bollworm on Cotton. Repositório Alice
BRAGA SOBRINHO, R.; YOUNG, J.H.; YOUNG, L.J..
Five larval instars of the bollworm, Heliothis zea Boddie were fed on five cotton plant parts and an artificial diet. Their effects on larval development and survival were analysed. The results showed that the highest mortality in first instar was for those placed on bolls. For the second and third instars, flowers, bolls, squares and leaves proportionated the highest percentages of survival. The lowest survival rate for the fourth instars was found on squares. The fifth instars showed high rates of survival on bolls, leaves and the artificial diet. Larval establishment was highly significant for larvae fed on flowers when compared with those fed on bolls. Larvae fed on terminal, leaves and squares took the longest time to reach the sixth instars. Pupae...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Heliothis zea; Larval weight; Feeding preference; Larval instar.
Ano: 1991 URL: http://www.alice.cnptia.embrapa.br/handle/doc/105733
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Vertical Distribution of Eggs and Larvae of the Bollworm Within the Cotton Plant. Repositório Alice
BRAGA SOBRINHO, R.; YOUNG, J.H.; YOUNG, L.J..
The cotton cultivar ´Tamcot CAMD-E´, Gossypium hirsutum L., was planted in three different planting dates. Five wood-framed screen cages were used to cover 30 cotton plants during match-head squares and blooming phase for each planting date. Five female and five male bollworm moths, Heliothis zea, were released in each cage. The majority of eggs were laid on the upper part of the plant. The greatest proportions of eggs were observed during the second infestation period, which coincided with the blooming phase. Leaves were the most common place for eggs deposition. Terminal alone is probably not a good place to scount for larvae. The greatest proportion of larvae were found on the upper part of the plant during the second infestation period, which coincided...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Heliothis zea; Gossypium hirsutum; Artificial infestation; Fenology.
Ano: 1991 URL: http://www.alice.cnptia.embrapa.br/handle/doc/106190
Registros recuperados: 2
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