Effect of Two Types of Plant Host on the Population Density of Aphis fabae, Aphis gossypii (Hemiptera: Aphididae) and their Parasitoids
Effect of Two Types of Plant Host on the Population Density of Aphis fabae, Aphis gossypii (Hemiptera: Aphididae) and their Parasitoids
Dalal Tareq Al-Ameri1, Khalid J. Al-Hussainawy2 and Hasan Al-Khshemawee3*
ABSTRACT
This experiment was conducted to determine the population density of Aphis gossypii and Aphis fabae on Borage (Borage officinalis: Boraginaceae) and Flora (Stachys macrosperma: Marcrosperma) plants and to know their attractive and repellent effects on both aphid species and their parasitoids. The highest density of A. gossypii on a B. officinalis plant was 74.33 adults/ang2, with a significant difference from A. fabae, which reached 22.53 adults/leave. However, the lowest density of the two aphid species was 29.66 and 1.33 adults/leave, respectively. The highest parasitism rate of A. gossypii on B. officinalis and S. macrosperma plants was recorded at 74 and 23.63%, respectively. The results showed that the highest rate of attraction on the B. officinalis was recorded at 66% for the alcoholic extract at a concentration of 25 mg/ml. In comparison, the highest rate of repellent for the cotton insect was 24% for the hot water extract. But, the highest rate of attraction to S. macrosperma plants was 22% for the hot water extract, and the highest rate of repulsion was 68% for the alcoholic extract at a concentration of 25 mg/ml on the two insects. The study also recorded three aphid parasitoids including Praon volucre (Haliday, 1833), Trioxys pallidus (Haliday, 1833), and Diaeretiella rapae.
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