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        Gum cordia effectively enhances foliage adhesion of neem oil and increases its efficacy against aphids (Homoptera: Aphididae)

        Ali Saqib,Haq Muhammad Abdul,Naz Shahina,Faheem Akbar Muhammad 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2

        The efficiency of pesticides is greatly affected by their ability to adhere and retain on foliage surface. Neem oil, though a very well-known source of many biologically active pesticidal compounds, is very sensitive to envi ronmental parameters, such as UV light. Also, due to volatilization, it is lost in environment and hence fail to reach target and show activity. In this study we attempted to stabilize neem oil emulsion and increase its retention on foliage surface by adding varying concentration of gum cordia. Gum cordia is an anionic poly saccharide derived from Cordia myxa fruits with strong adhesion and emulsification properties. The lethal concentration (LC 50 ) of the final formulations were also determined against aphid species Myzus persicae and Schizaphis graminum. Adhesion was found to be dependent on the concentration of gum cordia as well as type of crop. Increasing gum cordia in neem oil formulations resulted in increase in adhesion of the spray on the leaf surfaces and up to 6 times higher adhesion was observed with 0.5% gum cordia on mustard leaf compared to control. The LC 50 decreased with increasing gum cordia concentration. The LC 50 values of neem oil sprayed on mustard, spinach, and wheat leaves with 0.5% gum cordia were 0.205, 0.715, and 2.074% respectively while for neem oil control spray (with no gum cordia) LC 50 values were 1.833, 2.112, and 4.992% respectively for the above tested leaves. Presence of greater than 0.125% gum cordia in neem formulations provided the barrier against UV irradiation.

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