Author
Academic staff
Abstract
In recent years damage of green bud borer, Eucnaemidophorus rhododaetylus Den. & Schiff. (Lep.: Pterophoridae), has increased in the rose gardens of Kashan area. The adults are generally brown to gray, with length of 6-8 mm and wingspan of 20-24 mm. Fore and hindwings are divided into 2 and 3 lobes, respectively. The larvae are yellow to green, fusiform with maximum length of 12-13 mm. The pest spines silk treads to make its feeding nest in which it feeds on buds and flowers. Therefore, it reduces the flower number and amount of perfume and essence. Biology and growth characters of the pest were studied through regular inspections of different rose gardens. Longevity of adults and egg-laying capacity of females was studied using net sleeves. To study hibernation of the pest, samples from soil, debris, and bush foliage were inspected in laboratory. The study showed that in the region the pest feeds only on damask rose bushes. The highest damage rate was observed in rose fields of Barzok amounting 33.75%.The pest showed to be univoltine and hibernates as diapausing first instar larvae under cockles. Diapause takes from mid July to early April and larvae renewed their activity when rose bushes restart their growth. Average duration of different growth stages under field conditions were recorded as follows: egg 12.5 days, larva 60 days, pupa 10 days, and adult 15 days.
In recent years damage of green bud borer, Eucnaemidophorus rhododaetylus Den. & Schiff. (Lep.: Pterophoridae), has increased in the rose gardens of Kashan area. The adults are generally brown to gray, with length of 6-8 mm and wingspan of 20-24 mm. Fore and hindwings are divided into 2 and 3 lobes, respectively. The larvae are yellow to green, fusiform with maximum length of 12-13 mm. The pest spines silk treads to make its feeding nest in which it feeds on buds and flowers. Therefore, it reduces the flower number and amount of perfume and essence. Biology and growth characters of the pest were studied through regular inspections of different rose gardens. Longevity of adults and egg-laying capacity of females was studied using net sleeves. To study hibernation of the pest, samples from soil, debris, and bush foliage were inspected in laboratory. The study showed that in the region the pest feeds only on damask rose bushes. The highest damage rate was observed in rose fields of Barzok amounting 33.75%.The pest showed to be univoltine and hibernates as diapausing first instar larvae under cockles. Diapause takes from mid July to early April and larvae renewed their activity when rose bushes restart their growth. Average duration of different growth stages under field conditions were recorded as follows: egg 12.5 days, larva 60 days, pupa 10 days, and adult 15 days.
Key words: Damask rose, Biology, Bud borer, Eucnaemidophorus rhododactylus, Pterophoridae
Keywords
)