بررسی شناسایی گونه های زنجرک و بیولوژی گونه غالب آن در مزارع پنبه استان گلستان

Leaf hoppers are important pests of crops including cotton. This research was carried out during 2006- 2007 to identify the main leaf hopper species collected in the cotton of fields Golestan province and to study the biology of dominant ones. Observations are done from different cultivated and weed hosts. The specimen were collected and brought to the laboratory. The results revealed that the main species ofleafhopper were: 1- Asymmetrasca decedens (Paoli,1932) 2- Psammotettix alienus (Dahlbom, 1851) 3- Emposca decipiens Paoli,1930 4- Jacobiasca lybica (Bergevin & Zanon, 1922) A. decedens was determined as dominant species. The peak of activity was late in June to late in August in the cotton feilds. The natural enemies of this pest were bugs including; Nabis capsiformis(Ger.), Orius niger(Wolf.) and O. minutus(L.). The life of this species in the laboratory condition (24 :1:1 QC. and 75 :I: 5 % R.H) 25 - 35 days with egg incubation period of 7 - 9 days and nymph duration of 10 - 15 days. The adult lived 8- 11 days. This pest had 5-6 generation per year and over wintered as adult under some weeds. The main important hosts of this pest were cotton, potato, fabae bean, rapeseed, soybean and cucurbit from cultivated crops and black night shade, pigweed, mallow and goose weed from weeds

Keywords:

زنجرگان , شناسایی (گونه) , پنبه , آفات