A field study was conducted to evaluate the efficacy of five insecticides viz., Lambdacyhalothrin 5 EC, Novaluron 10 EC, Clothianidin 50 WDG, Indoxacarb 14.5 SC and Quinalphos 25 EC (standard check) against gram pod borer (Helicoverpa armigera H.) on chickpea (Cicer arietinum L.) variety Pratap Channa-1. Lambdacyhalothrin 5 EC gave the highest reduction in the larval population of pod borer and was found statically at par with Indoxacarb 14.5 SC. The next effective treatments were Clothianidin 50 WDG and Quinalphos 25 EC, However, Novaluron 10 EC @ 750ml/ha proved to be the least effective treatment as it resulted in lowest per cent reduction in the larval population. Highest cost benefit ratio of 1:2.10 was obtained from Lambdacyhalothrin 5 EC followed by Indoxacarb 14.5 SC (1: 1.65). The next cost effective treatment in terms of CBR was Quinalphos 25 EC (1:1.64), whereas, Novaluron 10 EC (1:1.15) and Clothianidin 50 WDG @ 500g/ ha (1:0.66) could not show any conspicuous gain over cost.
A field trial was conducted in Udaipur to the evaluate efficacy of carbosulfan 25% EC at 250, 312.5 and 375 g a.i. ha -1 along with thiamethoxam 25% WG at 25 g a.i. ha -1 , imidacloprid 17.8 SL at 25 g a.i. ha -1 and acetamiprid 20% SP at 10 g a.i. ha -1 against aphid (Myzus persicae) in cumin during Rabi, 2013-14 and 2014-15. The result revealed that two sprays of carbosulfan 25% EC at 375 g a.i. ha -1 was found effective against aphid. It caused maximum mean reduction in aphid population after second spray at 10 days after application, which was 87.52% and 88.45% during 2013-14 and 2014-15, respectively. It was followed by carbosulfan 25% EC at 312.5 g a.i. ha -1 . The maximum yields were recorded in case of carbosulfan 25% EC at 375 g a.i. ha -1 , which were 622.3 and 456.7 kg ha -1 during 2013-14 and 2014-15, respectively.
Background: Lac is a resin secretion of insects [Kerria lacca (Kerr)], which are commercially cultivated through ages. Lac cultivation has its roots in India and a major source of economy to the local populace. Though different lac hosts have been recorded in Rajasthan, but it is not cultivated commercially. Pigeonpea crop could be utilized for encouraging lac cultivation in the region and yield losses can be compensated by additional income received from lac resin.
Methods: The experiment on “Studies on Economics and Yield Attributing Parameters of Lac Cultivation on Yield of Pigeonpea, Cajanus cajan (L.) in Southern Rajasthan” was conducted on Rangeeni strain of lac insect in Baisakhi season at lac insect gene bank cum garden situated at Department of Entomology, Rajasthan College of Agriculture, MPUAT, Udaipur during 2019-20 and 2020-21 respectively. The life cycle of Rangeeni strain of lac insect were studied on pigeonpea sown in last week of August in plot size measuring 2 × 10 sq m during Baisakhi season of both year.
Result: The study revealed that the mean initial settlement density of lac insect on pigeonpea ranged from 67.53 to 84.20 with 4.27 to 5.27 (per sq. cm) mature female cell density during successive years. The mean per cent settlement was found to be the maximum (91.78 and 91.15%) at lower portion of the pigeonpea plant during respective years. The duration of sex differentiation ranged from 48.23 to 49.10 days for both successive years. The benefit cost ratio was also higher (1.95 and 2.09) in lac inoculated experiment then the sole seed crop (control) of pigeon pea (1.84 and 1.35) in season 2019-20 and 2020-21, respectively. All the parameter revealed that pigeon pea is economically efficient host for the Rangeeni strain of lac in agro-climatic region of southern Rajasthan.
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