Abstract
Two field experiments were conducted to test the efficacy of different dosesof thiamethoxam against okra sucking pests viz., Aphids, Aphis gossypii;leaf hopper, Amrasca biguttela biguttela, and whitefly, Bemisia tabaci andtheir predators in okra agroecosystem. Thiamethoxam 25% WG 25 g a.i./ha(84.71-91.73, 94.12 - 98.11% reduction over control) was highly effectiveagainst aphid, whitefly and leaf hoppers which was on par with 50 g a.i./ha (64.28 - 76.90, 83.70 – 87.92% reduction over control) and 75 g a.i./ha (73.48 - 81.26 and 85.26-92.42% reduction over control) after first andsecond spray, respectively. This was further followed by standard checkthiamethoxam 25% WG @ 25 g a.i./ha (Willoxam®). The plots treated withThiamethoxam 25% WG @ 25, 50 and 75 g a.i. /ha recorded the maximumpopulation of Coccinella spp recorded (4.22-5.10 and 4.33-6.21 nos.) afterfirst and second spray. Thiamethoxam 25% WG @ 75 g a.i./ha treated plotrecorded the maximum yield (8100 kg/ha-1) followed by thiamethoxam25%WG @ 25 and 50 g a.i./ha (7345 and 7690.5 kg/ha-1).
Highlights
Okra is a vegetable crop predominantly grown in tropics and subtropics
Two field experiments were conducted one at Madhampatti and second at Narasima nayakkanpalayam to test the efficacy of different doses of thiamethoxam against okra sucking pest of okra viz., Aphids, Aphis gossypii; leaf hopper, Amrasca biguttela biguttela, and whitefly, Bemisia tabaci
Thiamethoxam 25% WG at the rate of 75 ga.i.ha-1 reduced the mean aphid population significantly (4.35 nos. per three leaves/plant) with 91.73 per cent reduction over control and it was on par with thiamethoxam 25% WG at 50 and 25 ga.i.ha-1 (4.35 and 4.90 nos. per three leaves/plant) (Fig.1)
Summary
Okra is a vegetable crop predominantly grown in tropics and subtropics. In India, this vegetable is called as “Bhendi”. Okra is a source of higher fiber and good source of folate content. It contains vitamin A,B,K,C and excellent source of iodine. India is the largest producer of okra in Asia as well as in the world. In India, major okra growing states are Uttar Pradesh, Bihar and West Bengal. India rank first in the world with 5,784 thousand tones (72% of the total world production) of okra. In India Andhra Pradesh is the leading okra producing state which has production of around 1184.2 thousand tons from an area of 78.90 thousand ha, which a productivity of 15 ton/ ha. Its followed by West Bengal and Bihar, 882.39, 762.90 thousand tons from an area of 75.45 and 57.71/ha, respectively (Horticultural statistics at a glance,2015)
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