Environmental aspects for using some selected natural extracts in controlling certain pests to enhance biological control
Abstract: The present work was carried out to evaluate the toxicity of the extracts against Tetranychus urticae Koch, its predatory mite, Amblyseius gossipi El Badry and aphid, Aphis gossypii under laboratory and field conditions. Obtained data indicated that the spider mite females were more susceptible than females of the predacious mite to the toxic effect of all tested extracts. Predacious mite females were sensitive to direct spray application than the indirect method on treated prey. Natural extracts showed high mortality percentage against aphid, A. gossypii adults. Seventy two hours after treatment mortality of aphid A. gossypii adults varied significantly among tested concentrations. The study included the repellency effect of four different concentrations on mite and aphid. All the tested extracts gave poor repellency effect to aphid compared with mite. Obtained data indicate that high significant reduction was recorded after 3 days of treatment against T. urticae adults but after 24 hr. against predatory mite, Euseius scutalis Athais-Henriot under field conditions. Although, the rate of infestation reduction percent of the tested concentrations was increased as well as increasing the rate used but the rate of increase in efficacy was not proportional with the increase in the rate of concentration applied for all the investigated periods after treatments. Also, the rate of infestation reduction was significantly reduced with the lapse of time. Toxicity of tested materials was far less against the predator compared with T. urticae. These natural extracts were succeeded as fertilizers that effected on plant growth characters which had an important and effective role on competition between plants in increasing total yield in cucumber.
Publication year 2010
Availability location كلية العلوم – جامعة الزقازيق
Availability number
Organization Name
Country Egypt
Publisher Name: كلية العلوم – جامعة الزقازيق
Place: كلية العلوم – جامعة الزقازيق
Author(s) from ARC
Agris Categories Protection of plants - General aspects
AGROVOC
TERMS		 Aphis gossypii. Euseius gossipi. Tetranychus urticae.
Publication Type PhD Thesis
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