| Abstrakt: |
A study was conducted to assess the population dynamics of rice leaf mite, Oligonychus oryzae Hirst. during May-August, 2021 and 2022 in field condition at Agricultural Research Station, Nellore (ANGRAU, Guntur, India). During both years the mite population density commenced in the 3rd week of Jue with 4.35 and 7.35 mites /10 cm² leaf area, respectively and touched its peak density levels (48.21 and 54.21 mites /10 cm2 leaf area, respectively) during the 31st standard meteorological week (SMW) (first week of August) and 30th SMW (last week of July), respectively and the mite population started to decline gradually from 31st SMW and reached to negligible levels of 3.21 and 1.79 mites/10 cm² leaf area, respectively during last week of August i.e., 35th SMW. The leaf mite population had a significant positive correlation (r=0.624) with minimum temperature during 2021 in contrast during 2022 significant negative correlation was observed between the mite population and maximum temperature (r=0.483). The increase in mite population was found to be significantly correlated with an increase in humidity (r=0.504 RHM, r=0.533 RHE) during 2022. Rainfall and sunshine hours during 2021 and 2022 exhibited non-significant positive and negative relationships, respectively. [ABSTRACT FROM AUTHOR] |
