Population fluctations of sugarcane borers egg parasitoid wasp, Telenomus busseolae (Hym.: Scelionidae) in south of Khuzestan province
2010
Jamshidnia, A. | Kharazi-Pakdel, A | Allahyari, H. | Soleymannejadian, E.
The sugarcane stem borers, Sesamia cretica Led. and S. nonagrioides Lef. are the most important pests of sugarcane in Iran. The egg parasitoid wasp, Telenomus busseolae Gahan is the most important natural enemy of Sesamia spp. in Khuzestan province that play an important role in regulating populations of sugarcane stem borers. In order to evaluate the efficiency of T. busseolae on sugarcane borers, population fluctuations of parasitoid wasp were studied during two consecutive years (2007 and 2008). This study was done in Amir-Kabir Agro-industry in south of Khuzestan province. Sampling of egg masses were carried out every 15 days from April to November. The results of the present study indicate that egg batch densities of sugarcane borers ranged between 0.003-0.07 and 0.003-0.116 per plant during 2007 and 2008 respectively, and random distribution of egg batches were observed during two years. Discovery efficiency of parasitoid was 35-100 % and 44-93 % and egg parasitism ranged between 41.2-85.4 % and 45.4-87.3 % in first and second year respectively. T. busseolae showed high parasitism efficiency during two years (91.7% and 87.2% respectively). The mean adult emergence of parasitoid was 71.3% in first year and 75.9% in second year and the mean sex ratio were 74.4% and 65.2% in 2007 and 2008 respectively. During two years relative humidity was positively correlated with T. busseolae egg parasitism.
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