Abstract
The present study was undertaken during kharif 2013 and 2014 to know the relationship between weather parameters and chrysomelids (Coleoptera: Chrysomelidae)viz., Chaetocnema spp., Monolepta signata Oliverand Aulacophora foveicollis (Lucas)in rice agro-ecosystem in Mizoram, India.Chaetocnema spp., and M. signata were found to first invade the crop during last week of August, whereas A. foveicollis was recorded during third week of September. The highest populations of Chaetocnema spp. and M. signata were during September. However, the highest population of A. foveicollis was during October. Morning relative humidity (RH) had significant correlation with populations of Chaetocnema spp., M. signata and A. foveicollis. When there was abrupt fall in minimum temperature and coupled with increase in morning RH, rainfall and rainy days a build-up in Chaetocnema spp. population was recorded during the pooled year. These studies clearly indicate that weather factors play an important role in Chaetocnema spp., M. signata and A. foveicollis incidence.
Highlights
Rice, the staple food of over half of the world’s population, is grown in more than 110 countries
Climatic conditions largelyinfluence the insect pests number and activity as well as several parasites and predators either directly or indirectly (Arif et al, 2006; Kumar and Gupta, 2016; Saha et al 2016).Boopathi et al, (2012) have shown that besides the availability of new leaves and shoots, weather factors play an important role in Chaetocnema spp., M. signata and A. foveicollis incidence.The pest status does not remain static throughout the year but changes based on weather factors
Sampling was done at weekly interval accountinga dults of Chaetocnema spp., M. signata and A. foveicollis by counting number of beetles/ plant/hill from 10 randomly selected plants in 10 hills.The daily weather data for study period was obtained from the Meteorological Unit, ICAR Research Complex for NEH Region, Mizoram Centre, Kolasib, Mizoram, India
Summary
The present study was carried out at the research farm, ICAR Research Complex for NEH Region, Mizoram Centre, Kolasib, Mizoram, India during kharif season in both 2013 and 2014 with rice cultivar Gomati. Around 2000 m2 area was taken to study the population buildup of Chaetocnema spp., M. signata and A. foveicollis in lowland rice. The total area was divided into ten equal segments and SMW: Standard meteorological week *Data in interaction analyzed with Least Squares Means and means separated with standard error of the mean at P
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