Abstract
Abundance, infestation and disease transmission by thrips studied on groundnut at Kadiri of Anantapur (Andhra Pradesh) over six kharif seasons of 2011-16 indicated significantly higher abundance of thrips in 2016 over 2011 to 2015 with infestations on par among 2013, 2014 and 2016 and higher over other seasons. Peanut bud necrosis disease (PBND) transmission by thrips was significantly lower in 2015 and 2016 and higher in 2014. Associations of abundance of thrips with infestation and PBND were significant. Significant influence of PBND by the thrips infestation of only the current week implied significance of concurrent population in disease transmission.Significant positive effect of minimum temperature on incidence of PBND and negative effect of rainfall on thrips infestation were noted.Predictions of thrips abundance, infestation and PBND through multiple linear regression (MLR) models revealed positive influence of minimum temperature lagged by a week. Distribution of rainfall over its amount associated with thrips infestation besides negative role of wind with PBND was noted. Prediction models of PBND incidence combining weather and thrips abundance (R2:0.39) and weather and infestation (R2:0.53) showed that the PBND incidence was dependent on relative humidity andprevalent wind over previous two weeks in addition to thrips abundance or infestation.
Highlights
Groundnut (Arachis hypogaea L.) is an important oilseed crop grown in tropical, sub-tropical and warm temperate regions of the world
Studies on thrips population dynamics, thrips infestation and peanut bud necrosis disease (PBND) incidence and role of climatic factors to evolve forecasts based on datasets of six successive kharif seasons (2011-2016) at Anantapur (Telengana State) indicated prevalence of thrips and their damage throughout kharif season with peak activity during vegetative and flowering stage of groundnut at Kadiri (AP)
Increasing trend of thrips abundance and infestation and declining PBND over periods between 2011 and 2016 was observed at Kadiri (AP).Greater damage in term of plant infestation to groundnut crop is due to direct feeding over PBND transmitted virus by thrips
Summary
Groundnut (Arachis hypogaea L.) is an important oilseed crop grown in tropical, sub-tropical and warm temperate regions of the world. Groundnut crop suffers from a variety of insect pests, pathogens and weeds that cause heavy yield and monetary losses. No single species of thrips can be studied in isolation under field conditions for their abundance and plant infestations. Increasing complexity of thrips in terms of species diversity and abundance, besides their role in transmission of virus diseases necessitates evolving long-term strategies to cope with future challenges posed by climate change (Prasada Rao et al 2010). Nandgopal et al (2008) developed weather based model to predict thrips on groundnut in Saurashtra, while Kumar et al (2018) predicted pests of cotton in Maharashtra.Present study investigated dynamics of thrips abundance, severity of plant infestations and incidence of PBND at Kadri inAnantapur district ofAndhra Pradesh (AP) in relation to climatic factors towards evolving suitable forecast models for thrips and PBND Increasing complexity of thrips in terms of species diversity and abundance, besides their role in transmission of virus diseases necessitates evolving long-term strategies to cope with future challenges posed by climate change (Prasada Rao et al 2010). Nandgopal et al (2008) developed weather based model to predict thrips on groundnut in Saurashtra, while Kumar et al (2018) predicted pests of cotton in Maharashtra.Present study investigated dynamics of thrips abundance, severity of plant infestations and incidence of PBND at Kadri inAnantapur district ofAndhra Pradesh (AP) in relation to climatic factors towards evolving suitable forecast models for thrips and PBND
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