PJB-2024-284
EFFECT OF SYNTHETIC INSECTICIDES AND BOTANICAL EXTRACT AGAINST WHITEFLY, BEMISIA TABACI (GENNADIUS) (HEMIPTERA: ALEYRODIDAE) IN DIFFERENT OKRA VARIETIES
Muhammad Zubair
Abstract
Field efficacy of synthetic insecticides and neem seed extract against whitefly, Bemisia tabaci in different okra varieties was observed at Agriculture Research Station Swabi (ARS) during 2023. Two different experiments were conducted. In the first experiment, Population trend of Bemisia tabaci in 5 different okra varieties namely Marvi, Viraj, Sabz Pari, Green Finger and Advanta were recorded. Results showed that population of B. tabaci initially started in the 4th week of May and reached to its peak at 4th week of July with (6.21 whitefly per leaf). After that period again decline was observed till 1st week of September. Among the different varieties, minimum population of B. tabaci was recorded on Green Finger (2.08 whiteflies leaf-1), while variety Viraj showed higher susceptibility towards B. tabaci infestation (4.05 whiteflies per leaf). Rest of the tested varieties (Marvi, Sabz pari, Advanta) showed relatively moderate resistance to B. abaci infestation. The data regarding yield of different varieties showed that Green Finger resulted in highest yield (6064.4 kg/ha) while the variety Viraj showed the lowest yield (1834.8 kg/ha). The data regarding the evaluation of synthetic insecticides (Cypermethrin and Acetamiprid) and neem seed extract against B. tabaci showed that all the treatments were effective but the plot treated with Acetamiprid emerged as the most effective with lowest mean number of B. tabaci population (1.58 and 1.56 leaf-1) after 1st and 2nd spray respectively. The study further showed that Neem Seed extract with a mean population of white fly (4.79 and 4.84 leaf-1) after 1st and 2nd sprays respectively was effective in minimizing the B. tabaci population. Among the selected treatments, acetamiprid revealed the highest yield 2984 kg/ha and the highest cost-benefit ratio (26.52), showing its efficiency in both yield improvement and cost-saving, this was followed by plots treated with cypermethrin and Neem seed extract showed (22.26) and (19.69) cost-benefit ratio respectively. The study concluded that the okra variety Green Finger showed relatively higher resistance against B. tabaci population. Among the various treatments Acetamiprid and Neem seed extract significantly reduced B. tabaci population and is recommended to be integrated into IPM strategies to productivity and livelihood of okra farmers.
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