The effectiveness of spinosad and neem extract against Spodoptera littoralis (BOISD.) and Spodoptera exigua (HUBNER): exploring possibilities to enhance the bio-pesticide persistence with natural uv protectants under field-sunlight conditions of Saudi Arabia | [Pakistan Journal of Agricultural Sciences • 2017]

Author(s):

1. Sukirno Sukirno: Economic Entomology Research Unit (EERU), Plant Protection Department, College of Food and Agriculture Sciences, King Saud University,Riyadh 11450, Kingdom of, Saudi Arabia; Entomology Laboratory, Faculty of Biology, Gadjah Mada University,Yogyakarta 55281, Indonesia

2. Muhammad Tufail: Economic Entomology Research Unit (EERU), Plant Protection Department, College of Food and Agriculture Sciences, King Saud University, Riyadh 11450, Kingdom of Saudi Arabia; Organization of Advanced Science and Technology, Kobe University, Japan

3. Khawaja Ghulam Rasool: Economic Entomology Research Unit (EERU), Plant Protection Department, College of Food and Agriculture Sciences, King Saud University,Riyadh 11450, Kingdom of,Saudi Arabia

4. Said El Salamouny: Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza, Egypt; Economic Entomology Research Unit (EERU), Plant Protection Department, College of Food and Agriculture Sciences, King Saud University, Riyadh 11450, Kingdom of,Saudi Arabia

5. Koko Dwi Sutanto: Economic Entomology Research Unit (EERU), Plant Protection Department, College of Food and Agriculture Sciences, King Saud University,Riyadh 11450, Kingdom of,Saudi Arabia

6. Abdulrahman Saad Aldawood: Economic Entomology Research Unit (EERU), Plant Protection Department, College of Food and Agriculture Sciences, King Saud University,Riyadh 11450, Kingdom of,Saudi Arabia

Abstract:

Ultraviolet (UV) sunlight is considered to be the core factor reducing efficacy of bio-pesticides especially under the sunnyfield conditions. The effectiveness and persistence of two bio-pesticides neem plant extract and spinosad were evaluated under the simulated and field conditions against the cotton army worm, Spodoptera littoralis (Boisd.) and the beet armyworm Spodoptera exigua (Hubner). Our findings indicate that persistence of both the bio-pesticides was significantly reduced at 21 day post-application when tested against first instar larvae of the S. exigua. However, the use of natural UV protectants henna and clove, screened in the present study had conserved the effectiveness of both bio-pesticides at 21-day post treatment against the neonate larvae of S. exigua. In contrast, when the bio-pesticides were applied against neonate larvae of S. littoralis, only spinosad formulated with green tea and clove was found effective at 1 day post-application with 86% and 55% mortality, respectively. When these pesticides were applied against second instar larvae, again spinosad blended with clove was showing mortality of about 50% at 3 days of application, whereas all other formulations caused very low mortality. Thus, the present data conclusively demonstrate that the bio-pesticides persistence could be enhanced by using extracts of henna and clove and that their application could be effective only to newly infested crops with neonate larvae.

Page(s): 743-751

DOI: 10.21162/PAKJAS/17.5306

Published: Journal: Pakistan Journal of Agricultural Sciences, Volume: 54, Issue: 4, Year: 2017

Keywords:

biopesticides , UV protectants , Spodoptera littoralis , Spodoptera exigua , natural additives

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