Systematic & Applied Acarology
ISSN 1362-1971
An international journal of the Systematic and Applied Acarology Society, published since 1996


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Systematic & Applied Acarology (2007) 12, 1925.

Potential of garlic as grain protectants against Tyrophagus putrescentiae Schrank and Suidasia nesbitti Hughes in wheat

RACHNA GULATI

Department Of Entomology, CCS Haryana Agricultural University, Hisar-125 004, Haryana, India.

E-mail: brgulati@gmail.com

Abstract

The efficacy of commercially available garlic products viz., garlic oil, garlic powder and garlic oleoresin was evaluated against Tyrophagus putrescentiae Schrank and Suidasia nesbitti Hughes in stored wheat grains. All products reduced pest populations by 96 to 100% at a concentration of 0.2%. Garlic oil was the most potent against two mite species. It significantly reduced the population of T. putrescentiae (to average 33.24 mites) and that of S. nesbitti (to average 38.52 mites) in treated wheat grains. The population of T. putrescentiae in oleoresin and powder treated wheat grains was 39.37 and 50.31, respectively while that of S. nesbitti was 45.29 and 61.31, respectively as compared to untreated wheat grains (131 T. putrescentiae and 150 S. nesbitti mites). Eggs and larval stages were significantly (p<0.05) more susceptible to the garlic treatments than nymphs and adults. In garlic oil-treated grains (0.1% concentration), 10.3% and 11.8% of the eggs of T. putrescentiae and S. nesbitti, respectively, hatched, compared to 29.6 and 34% survival of these adults, at the same concentration. After an exposure of 45 days, garlic oil, oleoresin and powder provided 85.61, 64.56 and 79.85% protection against T. putrescentiae, as compared to 85.6, 63.62, and 78.96% against S. nesbitti in wheat grains.

Key words: Garlic products, storage, S. nesbitti, T. putrescentiae, wheat

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