Factors affecting colonization and abundance of Aphis gossypii glover (hemiptera: aphididae) on okra plantations

Ciência e Agrotecnologia

Germano Leão Demolin Leite²  Marcelo Picanço¹  José Cola Zanuncio¹  Marcos Rafael Gusmão¹ 

[1],Universidade Federal de Minas Gerais Núcleo de Ciências Agrárias Montes Claros MG

关键词: Abelmoschus esculentus;    aphid;    natural enemies;    leaf area;    nitrogen;    Abelmoschus esculentus;    afídeos;    inimigos naturais;    área foliar;    nitrogênio;   

DOI  :  10.1590/S1413-70542007000200011

来源: SciELO

【 摘 要 】

The control of Aphis gossypii Glover (Hemiptera: Aphididae) on okra Abelmoschus esculentus (L.) (Malvaceae) consist primarily in the use of insecticides, due to the lack of information on other mortality factors. The objective of this study was to determine the effects of predators and parasitoids, height of canopy, plant age, leaf areas, organic compounds leaves, levels of leaf nitrogen and potassium, density of leaf trichomes, total rainfall and median temperature on attack intensity of A. gossypii on two successive A. esculentus var. Santa Cruz plantations. Monthly number estimates of A. gossypii and natural enemies (visual inspection) occurred on bottom, middle and apical parts of 30 plants/plantation (one leaf/plant). Plants senescence, leaf areas and natural enemies, mainly Adialytus spp., spiders and Coccinellidae, were some of the factors that most contributed to aphid reduction. A higher number of aphids was found on the bottom part than medium and apical parts of okra plants. Total rainfall can reduce the aphid population. Trichomes non-glandular or low density, organic compounds leaves and levels of N and K were not important for reducing aphid population.

【 授权许可】

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