Hatay ilinde farklı kanola çeşitleri üzerinde lahana yaprak güvesi, Plutella xylostella (L.) (Lepidoptera: Plutellidae)’nin popülasyon yoğunluğunun değerlendirilmesi

Abstract

Aims: Evaluation of population density of the diamondback moth (DBM), Plutella xylostella (L.) (Lepidoptera: Plutellidae), on different canola varieties in Hatay province.Methods and Results: The study was conducted in 2007-2009 to evaluate population density of diamondback moth on different canola varieties in Hatay province. The study was carried out in six different canola 'Hydromel', 'Elvis', 'Sarı', 'Lycosmos', 'Hunter' and 'Sory' varieties. Samplings were done by using a 45-cm diameter sweep-net, taking 25 (back-forth) sweep samples per site. The DBM larvae were sorted out from plant materials, counted and recorded for each of the sampling locality and canola variety in order to evaluate population density of P. xylostella. After three years of the study, the population density of pest varied in each of the sampling year and variety of canola. In 2007, a total of 348 DBM larvae were caught by sweep-net on five different canola varieties and canola fields. The largest mean of DBM larvae catches by sweep-net were recorded on 15 May on variety of ‘Lycosmos’. In 2008, A total of 1009 DBM larvae were caught by sweep-net on four different canola varieties and eleven canola fields. The largest mean of catches by sweep-net were recorded on 10 April on variety of ‘Elvis’ (Atçana III), followed by variety of ‘Hunter’ (Demirköprü I), ‘Sarı’ (Demirköprü I), ‘Lycosmos’ (Demirköprü II). In 2009, a total of 75 DBM larvae were caught by sweep-net on canola variety. The largest number of DBM larvae catches by sweep-net were recorded on 22 April, followed by 20 May. Conclusions: The highest number of the DBM larvae were caught by sweep-net in May, following in April in three years. In addition, the highest number of the DBM larvae were caught by sweep-net on variety of ‘Lycosmos’, following by ‘Elvis’, and ‘Sarı’ cultivars.Significance and Impact of the Study: The diamondback moth is important pest of brassica vegetable and oilseed crops in Turkey. The highest number of the DBM larvae were caught by sweep-net in May, following in April during the sampling periods. In addition, the highest number of the DBM larvae were caught by sweep-net on variety of ‘Lycosmos’, following by ‘Elvis’, and ‘Sarı’ cultivars.