Field experiments on the susceptibility of onion to thrips infestation were carried out in 2012 and 2013. The investigation used 18 cultivars and 5 breeding lines of Allium cepa, and the species A. fistulosum and A. roylei. In 2012 A. fistulosum was one of the most infested plants, whereas in 2013 infestation was no more than average. The most infested cultivars of A. cepa were ‘Efekt’, ‘Alonso F1’, ‘Alibaba’ and ‘Wama’ and the ‘NOE5’ breeding line. In 2012 the extent of damage ranged from 12 to 55%, in 2013 from 20 to 30%. The ‘NOE2’, ‘NOE3’ and ‘Wama’ cultivars were the most seriously damaged by thrips. Leaf damage to A. fistulosum was minimal. No damage was caused to the wild species A. roylei by feeding onion thrips.
In Poland chemical control of thrips in pea crops currently relies on insecticides with several modes of action, including pyrethroids (deltamethrin, cyhalothrin, cypermethrin) and neonicotinoids. The first insecticide treatment is recommended to be applied during the full bloom of pea plants and the second two repeated at intervals of 7 days. Field experiments were carried out at the Experimental Station in Mydlniki (near Kraków, southern Poland) over two years (2011 and 2012). Acetamiprid (neonicotinoid) (trade name Mospilan 20 SP) was used to control thrips on peas in the experiment. The results suggest that the conventional spray regime consisting of one weekly application of Mospilan 20 WP starting at full flowering can be replaced by one treatment at the beginning of flowering.
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