Abstract

Field studies to assess the efficiency of bio-extracts against the scourge of onion crops, Thrips tabaci Lindeman in Egypt

Author(s): Salem S. A., Abd El-Salam A. M. E., Abdel-Raheem M. A., Farage N. A. and El-Hawary F. M.

Onion thrips (Thrips tabaci Lindeman ) have become major pest invasive onion crops in Egypt. To propose an alternative to chemical control, the repellency or toxic effect of five plant extracts was evaluated against adult females thrips in the field. The materials used are: neem oil; neem leaves; Achook; lemon oil and garlic oil. The results indicated that all the extracts reduced the number of the tested insect pest and seed damage as well as increased seed yield by 2-3 times compared to the untreated control in the two seasons of investigation. Results of the present finding therefore suggest the alternative to chemical pesticides. It is safe for human; farm animals and environmentally friendly. The lemon oil and neem oil extracts showed superior efficiency in the management of the target pest in the field. Data also showed the increase % adult mortality after 72 h.. Achook powder had less effect on the % of adult mortality. The release of repellent or volatile masking substances into the air by associated plants may disrupt the olfactory orientation of onion thrips. In our studies, we revealed that the use of neem leaves and Achook affect on the response of onion thrips on flower volatiles. The main investigations which finding during and after treatments , suggest to cultivate onion crop in rows by alternative with other rows cultivate with another crop ( example : 5 rows onion and other one by garlic ) .

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