Abstract
A field experiment was carried out to study the population dynamics of sorghum mite (O. indicus) infesting sorghum and its relation with different biotic and abiotic variables during 2019 and 2020 at Navsari Agricultural University, Navsari, Gujarat. The results revealed that mite population starts to build up during 34th SMW with 0.38 and 0.46 mite/2?2 cm2 leaf area during kharif-2019 and 2020, respectively and continued till the crop maturity. Further, the population of mite increased gradually and reached to its peak in 42nd and 41st SMW i.e., 8.92 and 9.42 mites/2?2 cm2 leaf area during kharif-2019 and 2020, respectively. During both the year of study, the bottom leaf canopy of sorghum harboured maximum mite population. Based on pooled data, both natural enemies showed highly significantly positive relationship with sorghum mite population. The sorghum mite population exhibited highly significant positive relationship with maximum temperature while, it had a significant positive correlation with average temperature, while a nonsignificant negative correlation exist with minimum temperature. Further, the morning, evening and average relative humidity had significant negative relationship with O. indicus. The rainfall and rainy days had highly significant negative influence on the spider mite population, however, the sunshine hours showed significant positive relation with the population of sorghum mite.. KEYWORDS :Sorghum, Oligonychus indicus Hirst, biotic factors, predators
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