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Effects of neem (Azadirachta indica) extracts onLeptocorisa chinensis under choice and no-choice conditions

  • Entomology
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Abstract

Two extracts from neem (Azadirachta indica A. Juss. (Meliaceae)) seeds, azadirachtin and oil, and a mixture of neem oil and abamectin, were tested on second-instar nymphs of the rice bugLeptocorisa chinensis (Dallas) (Hemiptera: Alydidae). To clarify the effect of spraying coverage on bioefficacy of test materials, experiments were conducted under choice and no-choice conditions in field cages. In a choice test, treatment with the mixture of neem oil and abamectin was most effective in reducing the survival ofL. chinensis, followed by azadirachtin at 60 ppm, 30 ppm and 3% neem oil, whereas all treatments except neem oil caused 100% mortality within 3 weeks in a no-choice test. When second-instar nymphs had choices of treated and untreated plants within a treatment, no differences in yield and sum of dead and stained grains were found between those two choices, indicating that nymphs neither caused significant reduction in yield nor reduced the quality of untreated plants. Regardless of treatment, the difference in overall yield between treated and untreated plants under choice conditions was not statistically significant (P>0.05). Our results indicate that neem-based formulations, used alone or in combination with abamectin, have the potential to be integrated into the existing programs to control the rice bug.

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Authors and Affiliations

  1. Dept. of Entomology and Nematology, National Agricultural Research Center, 305-8666, Tsukuba, Japan

    De-Ling Ma, Yoshito Suzuki, Hiroaki Takeuchi, Tomonari Watanabe & Mami Ishizaki

Authors
  1. De-Ling Ma
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  2. Yoshito Suzuki
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  3. Hiroaki Takeuchi
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  4. Tomonari Watanabe
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  5. Mami Ishizaki
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Corresponding author

Correspondence to Yoshito Suzuki.

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http://www.phytoparasitica.org posting Aug. 28, 2005.

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Ma, DL., Suzuki, Y., Takeuchi, H. et al. Effects of neem (Azadirachta indica) extracts onLeptocorisa chinensis under choice and no-choice conditions. Phytoparasitica 33, 506–514 (2005). https://doi.org/10.1007/BF02981400

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  • DOI: https://doi.org/10.1007/BF02981400

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