Journal article

Publication year: 1995

Pages: 137-139

Journal: Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz

Volume number: 68

Issue number: 6

ISSN: 0340-7330

DOI Link: https://doi.org/10.1007/BF01911051

Publisher: Blackwell

Abstract: 

As neem (Azadirachta indica A. Juss.) seed is still quite expensive in the Dominican Republic, it was tried to reduce the dosage by increasing the efficiency of the insecticide using the adjuvant Tersan(R) (Alcohol-9-ethylen-oxid).

The effect of various aqueous neem seed extracts (25 g seeds per 1, 40 g/l, 60 g/l, oilcake 15 g/l) and formulated neem oil mixed with the adjuvant was tested in laboratory and field trials against Bemisia tabaci on eggplant. In laboratory trials the efficiency of all tested products except neem oil was increased by 24% to 48%. The increase of efficiency was more pronounced on very hairy than on glabrous plants. These positive results could not be confirmed in field trials, where the adjuvant had no effect or even reduced the efficiency of the insecticide.

The effect of the adjuvant is a reduction of the surface tension of the spraying mixture for better wetting and to adhere it to the leaf. As the laboratory plants usually possessed much more hairs than those in the field, the insecticide could develop its full effect in the field even without support by the adjuvant.

Harvard Citation style: TAPPERTZHOFEN, S. (1995) ON THE EFFECT OF NEEM PRODUCTS ON BEMISIA-TABACI USING DIFFERENT ADJUVANTS, Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz, 68(6), pp. 137-139. https://doi.org/10.1007/BF01911051

APA Citation style: TAPPERTZHOFEN, S. (1995). ON THE EFFECT OF NEEM PRODUCTS ON BEMISIA-TABACI USING DIFFERENT ADJUVANTS. Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz. 68(6), 137-139. https://doi.org/10.1007/BF01911051