Effectiveness
of Bacillus thuringiensis var.
kurstaki on Hyphantria cunea Drury
(Lepidoptera : Arctiidae) in Autonomous Republic of Adjara-Georgia
Temel GÖKTÜRK1 Yaşar AKSU2
1Artvin Coruh University, Forest Faculty, Artvin
Turkey.
2Artvin Regional Forestry Managgement, Artvin, Turkey
This study was
conducted to determine the efect of Bacillus
thuringiensis var. kurstaki (Btk)
on the larvae of Hyphantria cunea
Dury, (Lepidoptera: Arctiidae) in 2011. The fall webworm, probably has the
widest host range for any insect. The larvae feed on an estimated 600 species
of plants worldwide. The fall webworm, had been included in the European Union
Protection Organization quarantine list and removed from it in 1999. The insect
has been causing damage in forests and agricultural fields as well as in fruit
orchards in Autonomous Republic of Adjara- Georgia since 2003. H.cunea is an insect pest of road-side
and garden and parks trees in Adjara (Kobuleti, Ureki, Ozurgeti, Khelvachauri
regions) where in summer during resort season, nearly all plants are destroyed
by fall webworm, various control methods have been used against the pest H.cunea such as Mechanical (removal of
nets), biological (encourage predators and parasities; apply Btk) and chemical
(Standard and systematic insecticides) control. A stain of Btk has recently
been identified that has demostrable activity against the larvae of fall
webworm. Btk formulation, Bio-T Plus (consisting of 32,000 IU mg spores) was
evaluated for fall webworm control in a application area with dense vegetation.
Btk (2 liters per hectare) was sprayed to target H.cunea larval habitats of 70 hectare once every generation using a
motorized back pack mist blower. Lt was determined that the pesticide was
effective on the 2nd and 3rd larvae stages of the fırst generation with 85.5%
and the 2nd and 3rd larvae stages of the second generation with 89.1%. lt was
also estimated that the pesticide was effective on the 4th and 5th larvae
stages of the fırst generation with 72.6% and the 4th and 5th larvae stages of
the second generatidn with 74.4%. These results show that the pesticide was
more effective on the 2nd and 3rd larvae stages.
This significant reduction was
achieved with conventional manual application methods. The present study showed
that Btk has got positive effect for control of H.cunea. They are highly effective against H.cunea, yet they dont harm humans, most beneficial insect,
mammals, birds and other nontarget organism.
Yayın yeri: Göktürk, T.; Aksu, Y.; Effectiveness
of Bacillus thuringiensis var.
kurstaki on Hyphantria cunea Drury
(Lepidoptera : Arctiidae) in Autonomous Republic of Adjara-Georgia.
International Scıentıfıc Conference Biological Plant Protection, Problems and
Contemporary Achievemensts Book of Abstracts, Agrıcultural Üniversity of
Georgia, 2012 Sayfa 10 Tiblisi Georgia.
