Biology and population fluctuation of broom corn aphids in Miyaneh region, Iran

Subject Areas : Agroecology Journal

Shahram Shahrokhi ¹ (Ph.D. of Entomology, Islamic Azad University, Miyaneh Branch)
Habib Ollah Khodabandeh ² (M.Sc Student of Entomology, Islamic Azad University, Miyaneh Branch)
Koroush Siami ³ (B.Sc of Agronomy, Islamic Azad University, Miyaneh Branch)

Received: 2017-02-16 Accepted : 2007-04-20 Published : 2007-03-21

Keywords: Fertility, Aphid, Broom corn, Population fluctuation, Biological Characteristics, Longevity, generation time,

Abstract :

Broom corn is one of the most important crops in Miyaneh region, Iran. Aphids are major pests of the crop and farmers use different chemicals to their control in several times. In this research, broom corn aphids were collected and identified. Population fluctuation of the aphids was also investigated by weekly sampling and their biological characteristics were studied using leaf cages. The results revealed that, there were two species including Schizaphis graminum and Rhopalosiphum maidis in broom corn fields. Population peak of S. graminum (mean number of 10.725 aphids per tiller) was observed in June and decreased rapidly in July. R. maidis appeared later than S. graminum, but it was the most injurious aphid species of  broom corn during all growing season. R. maidis population and it’s honeydew covered some plants and caused necrosis so that it’s number reached more than 1000 aphids per tiller. Mean number of this species reached to 114.75 aphids per tiller and then decreased rapidly. In laboratory studies, mortality rate of S. graminum and  R. maidis on broom corn leaves was relatively low (3.2 and 5.6 percent). Nymphs of both species matured in less than 10 days. Mean longevity and mean fertility of mentioned aphid species was 28.2 and 32.6 days and 41.84 and 49.7 nymphs per female respectively. Mean generation time of S. graminum and R. maidis was also 11.3 and 10.9 days respectively.

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