Department of Entomology, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur - 176062, Himachal Pradesh, (India).
Studies on the parasitization of Lipaphis erysimi Kalt. by Diaeretiella rapae indicated that D. rapae appeared in the second week of January. Maximum parasitization (51.07%) was recorded in the second week of March when mean maximum temperature, mean minimum temperature and relative humidity was 22.5°C, 10.3°C and 36%, respectively. Temperature, relative humidity and rainfall had no significant impact on the population buildup of both L. erysimi and D. rapae.
