Browsing by Author "Nitin Joshi"

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Evaluation of integrated pest management modules against gram pod borer in chickpea (Cicer arietinum)
(2009) A.K. Singh; C.P. Srivastava; Nitin Joshi
Field experiments were conducted during winter (rabi) 2003-04 and 2004-05 to evaluate the effectiveness of integrated pest management (IPM) modules against gram pod borer, [Helicoverpa armigera (Hüibner)], on chickpea (Cicer arietinum L.). Amongst the various modules evaluated for 2 years on 'BG 256' chickpea in Mirzapur district, Uttar Pradesh, module M 5 (sole crop of chickpea, pheromone traps @ 20/ha, bird perches @ 20/ha, endosulfan 35 EC @ 0.07% a.i. and chlorpyriphos @ 0.05% a.i.), followed by M 2 (sole crop of chickpea, pheromone traps @ 20/ha, bird perches @ 20/ ha, methomyl 40 SP @ 1.0 kg/ha of formulated insecticide and 2 sprays of HaNPV @ 400 LE/ha) were found effective in managing the population of H. armigera. On an average, the grain yields were higher in M 5 (1 382 kg/ha), followed by M 2 (1 196 kg/ha) in comparison to the other modules including farmers' practice. The highest cost : benefit (C : B) ratio was obtained in M 5 (1:5.09), followed by M 4 (1:2.2). Though, least population of natural enemies was recorded in M 5, the module proved superior to other modules in respect of managing pest population and C:B ratio and hence could be utilized by farmers.
Evaluation of integrated pest management modules for insect pests in short duration pigeonpea (Cajanus cajan) in eastern Uttar Pradesh
(2006) Nitin Joshi; C.P. Srivastava
A field experiment was conducted during rainy season (Kharif) 2001 and 2002 to evaluate the effectiveness of 5 IPM modules for the pests of pigeonpea (Cajanus cajan (L.) Millsp.) Amongst the various modules evaluated against the pests of 'UPAS120' pigeonpea, module 2 (M2) could effectively manage the population of Helicoverpa armigera (Hübner) and Melanagromyza obtusa Malloch. Grain yield was also significantly higher (767.8 and 796.7 kg/ha in 2001 and 2002 respectively) in comparison to other modules including farmer's practice. The highest C:B ratio's of 1:3.22 and 1:3.35 were recorded in this module during both the years.
Forecasting of helicoverpa armigera populations and impact of climate change
(2010) C.P. Srivastava; Nitin Joshi; T.P. Trivedi
Helicoverpa armigera (Hubner) is a polyphagous insect pest and has been reported to feed on at least 181 plant species belonging to 45 botanical families in India. This insect pest has become of national importance because of huge losses caused to the high value crops such as cotton, soybean, tobacco, pulses, vegetables and cereals etc. Forecasting of the pest occurrence and peak activity periods is the prerequisite for an economically viable, environmentally sound and easily adaptable pest management programme. Adult population of H. armigera has been monitored successfully throughout India with the help of pheromone traps. By using the pheromone trap data, egg and larval count in the fields, damage caused to the crops and meteorological data, especially rainfall and temperature, region-specific prediction models have been developed and validated for Andhra Pradesh, Karnataka, Uttar Pradesh and Punjab. Rainfall has been found to be important factor in forecasting H. armigera in Andhra Pradesh and Karnataka. Temperature played the major role in the prediction model developed and validated for Uttar Pradesh. Whereas in Punjab, the peak population of H. armigera during March-April is dependent on temperature and humidity in February, while the high population during October depended on the rainfall during the rainy season.