Acrolepiopsis assectella

Salmane, Ineta, Apenīte, Ilze & Ciematnieks, Rinalds, 2013, Environmentally Friendly Organic Products And Onion Pests In Latvia, Acta Biologica Universitatis Daugavpiliensis 13 (1), pp. 101-108 : 104

Acrolepiopsis assectella

Adults of onion leek moth were recorded on sticky traps in both investigation seasons ( Figure 1 ), but no damages caused by A. assectella maggots on onion leaves were recorded in 2012. Very few damages of the above pests were recorded over the vegetation season of 2011. At the first assessment time in control plots the highest level of damage was stated. Over the vegetation season several cases of damage at the second and the third assessment times were recorded ( Fig. 2 ).

In similar studies in Germany ( Richter & Hommes 2003) variable infestation levels of onions by A. assectella was observed: in one season damage was stated only by overwintered generation but no infestation by summer generations. In another vegetation season a severe infestation during the whole season was recorded. Unfortunately reasons for such variations were not interpreted.

Figures

Fig. 1. Average number of individuals of D. antiqua, A. assectella and Ph. atricornis recorded on the yellow sticky traps in onion plantations, SSCBI, Dižstende. a) vegetation season 2011, b) vegetation season 2012. (Over a vegetation season, 1 - 6 times sticky traps were exposed).

Fig. 2. Average amount of onion plant damages (%) caused by A. assectella, SSCBI, Dižstende, 2011. (Only treatments in any assessment having non-zero values are presented).