The Bıology and Damage of Lymantria dispar L. (Lepidoptera: Lymantridae),

Whıch Harms Leaved Tress ın and Around the cıty of Batum ın Georgıan

Republıc, and the Control Agaınst ıt

Temel GÖKTÜRK¹             Yaşar AKSU²

¹The University of Artvin Coruh, Faculty of Forestry

                                                     ²Artvin Forest Department, Forest Protection

Abstract

We have 276 kilometers of borders with Georgia, which is our northern neighbor. Our regions that are in the borderline have similar cultural and linguistic properties, and the factors that cause damages in forests and agricultural fields are also similar. One of these harmful factors is insects. Lymantria dispar L. (Lepidoptera; Lymantridae) cause important damages in and around Georgia-Batum City and in Artvin City in Turkey. This study was conducted for the purpose of determining the biology, damage and fight against L. dispar in areas that have thick leaved trees with mainly oak (Quercus) forests in 2013-2014. The material of the study consisted of eggs, pupa and larvae of L.dispar, wire cages and NeemAzal®-T/S and Dipel® DF BT 500gr/100lt (Bacillus thuringiensis var. kurstaki). 40 larvae were placed in cages and were fed with fresh oaken leaves. After the administration of the medications, the cages were checked every 6 hours and the alive and dead larvae were counted. The trials were performed with 4 repetitions, and the data were analyzed in a statistical manner. At the end of the study, it was determined that L. dispar gave one generation in annual scale in Georgia-Batum, caused most damage in oak trees, the larvae hatched in March-April and became pupa after 6-9 weeks of nutrition, and the adults of the pupa laid 150-600 eggs. L. dispar fed on the leaves of Quercus, Salix Populus, Fagus, Castanea, Ulmus, Betula, Acer and all fruit trees, and caused damages in the region. It was also determined that the larvae caused the most damage in fruit trees. For the purpose of fighting L.dispar larvae, organic and bio-insecticide applications were performed and the effect rate was determined as 83.6% in Dipel® DF BT; as 81.3% in NeemAzal®-T/S. It was also determined that the Exorista segregata Rondani, Drino inconspicua Meigen, Compsilura coccinnata Meigen (Diptera, Tachinidae) and Brachymeria intermedia (Nees) (Hymenoptera, Chalcididae) parasitoids came out from some of the caterpillars placed in the cages. In on-site observations, it was also seen that Calosoma sycophanta (L.) (Coleoptera, Carabidae) fed on the larvae of L.dispar, and some bird species played important roles in the decrease in the population of the larvae.In the light of these data, it was concluded that NeemAzal and Dipel may be used in the fight against L.dispar; and in addition, natural enemies of this insect must be protected to be influential in the control.

KeyWords: Lymantria dispar, NeemAzal, Dipel

Yayın yeri: Göktürk, T.; Aksu, Y.;  The Bıology And Damage Of Lymantria dispar L. (Lepidoptera: Lymantridae), Whıch Harms Leaved Tress In And Around The Cıty Of Batum In Georgıan Republıc, And The Control Agaınst It, 1. International Congress On Vacational and Technical Sciences, The Book Of Abstracts 2017 Batumi / Georgıa. Pages 103-104.