2014 Volume 1 Issue 3

Population trends of certain canola arthropods with notes of its resistance to some sap feeding insect pests

Sobhy A.H. Temerak, Tarek M. Abo-ELmaged, Safaa M. Amro

Canola plantations are considered as an important reservoir of several arthropod pests and natural enemies. Two canola cultivars (Serw and Bactol) were cultivated during 2011/2012 growing season at Assiut Governorate. Sixteen arthropod species belonging to 12 families and 6 orders, rather than the predatory true spider were recorded. The collected species were divided into: 7 phytopahgous; 5 predators; 2 parasitoids and 2 beneficial species. The cabbage aphid Brevicoryne brassicae L.; the peach aphid Myzus persicae (Sulz.) and their parasitoids Diaeretiella rapae (McIntoch) and Praon nicans (Mackauer) in addition to thrips, Thrips tabaci Lind. constituted the most frequent, dominant and abundant species inhabiting canola plantations. The phytophagous group constituted more than 85%, while the predatory one's constituted less than 14%. The abovementioned species were found to be active from the last week of February till harvesting after (April 9). Concerning the aphid parasitism, the first appearance of aphid parasitized mummies by D. rapae and/or P. nicans was recorded in the second half of March. The greatest parasitism percentage was recorded on April 9 with an average of 79.5% and 77.58% on Serw and Bactol cultivars, respectively. Both of the tested cultivars were appeared as susceptible (S) to onion Thrips T. tabaci and showed different resistance categories to aphid species. This study needs more attention by plant breeders to transfer genes responsible for resistance to the newly produced and/or improved cultivars.

Keywords: Canola, Arthropod pests, Natural enemies.


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