Population dynamics of the cabbage aphid Brevicornae brassicae (Hemiptera : Aphididae)‎ infesting canola in el-Minia governorate

Abstract EN

The present studies were carried out throughout the period from 2016-2017 to 2017-2018.

The main objectives were studying population dynamics of the cabbage aphid Brevicornae brassicae L.

(Hemiptera: Aphididae) infesting canola in Malawi, El-Minia Governorate.

Data showed that the migration of aphid from the overwintering site into canola field occurred after about 26 days (nearly during the second week of December).

Maximum population density of the cabbage aphid occurred after about 97 days.

Therefore, the peak of abundance could expect around the end of February and the beginning of March.

The population then vanished from the canola field in 122 days (toward the end of March).

Also, the present results indicated that the number of cabbage aphid was significantly higher in the second season 2018 than that of first 2017.

The differences in levels of infesting between the seasons might be attributed to the differences in weather factors (temperature and relative humidity) and / or the effect of the common natural enemies in each season.