Aqueous extracts and oil of neem combined with neonicotinoid insecticides against Bemisia tabaci biotype B in melon

Ciência Rural

Maria Santana De Araújo Trindade²  Adalberto Hipólito De Sousa¹  Patrício Borges Maracajá²  Rui Sales Júnior²  Wilson Galdino De Andrade² 

[1] ,Universidade Federal Rural do Semi-Árido Departamento de Ciências Vegetais Setor de FitossanidadeMossoró RN ,Brasil

关键词: Insecta;    whitefly;    insecticidal plant;    Insecta;    mosca branca;    planta inseticida;   

DOI  :  10.1590/S0103-84782007000600046

来源: SciELO

【 摘 要 】

This research was aimed at evaluating nymph population density of whitefly (Bemisia tabaci biotype B) in melon plants after treatment with neem-dry-leaf aqueous extracts and neem-oil ( A. Juss.) applied alternately with neonicotinoid insecticides under field conditions. The experimental design was a randomized block, with 6 treatments and 4 replications. The treatments were control (only water); neem-dry-leaf extract at 5% (neem-dry-leaf powder 50g L-1 of water); neem oil (5.0mL L-1 water); chemicals insecticides imidacloprid (30g 25L-1 of water) and acetamiprid (5g 20L-1 of water); neem-dry-leaf extract at 5% weekly alternated with imidacloprid (30g 25L-1 of water) and acetamiprid (5g 20L-1 of water); neem oil (5.0mL L-1 of water) weekly alternated with imidacloprid (30g 25L-1 of water) and acetamiprid (5g20 L-1 of water). The efficiency of treatments was compared through of the number of nymphs recorded in leaves of melon with 35, and 50 days after planting. The less number of nymphs was registered when the neem oil was applied alternatively with the chemical treatment with efficiency of 28.58 and 7.85% in the first and second evaluations, respectively. However, the nymphs incidence was higher when the neem oil and the chemical treatment were applied separately.

【 授权许可】

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