Author(s):

Avani Bhalu, YH Ghelani, MK Ghelani, BV Patoliya and VB Bhalu

Abstract: Investigations on management of whitefly, Bemisia tabaci (Gennadius) infesting okra was carried out under field condition during the kharif, 2018 at Instructional Farm, Junagadh Agricultural University, Junagadh, Gujarat, India. For the management of whitefly, the effect of different potash fertilizer dose and foliar application of insecticides against whitefly, three potash fertilizer dose viz., K₁: potash fertilizer @ 60 kg/ha, K₂: potash fertilizer @ 80 kg/ha and K₃: potash fertilizer @ 50 kg/ha as a soil application and foliar application of insecticides viz., I₁: triazophos 40 EC @ 20 ml/10 lit, I₂: acetamiprid 20 SP @ 3 g/10 lit, I₃: diafenthiuron 50 WP @ 10 g/10 lit and I₄: control were tested. The combination of soil application of fertilizer and foliar application of insecticides viz., K₁I₁, K₂I₁, K₃I₁, K₁I₂, K₂I₂, K₃I₂, K₁I₃, K₂I₃, K₃I₃, K₁I₄, K₂I₄ and K₃I₄ were evaluated against the pest. Based on pooled over periods, K₂I₂ (potash fertilizer @ 80 kg/ha + spray of acetamiprid 0.006%) followed by K₂I₁ (potash fertilizer @ 80 kg/ha + triazophos 0.04%) and K₂I₃ (potash fertilizer @ 80 kg/ha + diafenthiuron0.05%) were found most effective in controlling whitefly population. Significantly highest (13106 kg/ha) yield harvested in the plots treated with K₂I₂ (potash fertilizer @80 kg/ha + acetamiprid 0.006%) followed by K₂I₁ (potash fertilizer @80 kg/ha + triazophos 0.04%) [12782.29] and K₂I₃ (potash fertilizer @80 kg/ha + diafenthiuron 0.05%) [12088].

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