Effect of dates of sowing and insecticidal spary on arthropods diversity in direct seeded rice ecosystem

Abstract

The present studies were conducted at Punjab Agricultural University Ludhiana and PAU Regional Research Station Gurdaspur during Kharif 2017-18 to determine arthropods diversity under paired row direct seeded rice with different dates of sowing and sprayed & unsprayed condition. The total 94 species of arthropods were recorded in direct seeded rice ecosystem. Among three dates of sowing, the highest arthropods diversity index was observed in the second date of sowing (first fortnight of June) due to higher evenness index and it was followed by third (second fortnight of June) and first (second fortnight of May) date of sowing. Higher diversity was recorded at Gurdaspur as compared to Ludhiana. The highest leaffolder& stem borer incidence and planthoppers population was also observed in third date (second fortnight of June) of sowing. The leaffolder incidence and planthoppers population was higher at Gurdaspur whereas stem borer incidence was higher at Ludhiana.