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Articles by N. Shayesteh
Total Records ( 2 ) for N. Shayesteh
  F.A. Lolestani and N. Shayesteh
  The insecticidal and ovicidal effects of essential oil extracted from Ziziphora clinopodioides (Boiss.) (Lamiaceae) were tested on adults and eggs of Callosobruchus maculatus (Fab.). Oil concentrations of 9, 12.5, 17.6, 24.5 and 34.2 μl L-1 air were tested on adults while concentrations of 3.5, 5.8, 9.7, 16.1 and 26.7 μl L-1 air were tested on eggs. Adults and eggs were exposed for 24, 48 and 72 h. After each exposure, insecticide effect was estimated by counting the number of dead adults of C. maculatus while ovicidal effect was estimated by counting the number of unhatched eggs. Results showed that the oil had high fumigant action against adults and eggs, the adults being more susceptible than the eggs. After 72 h of exposure to an oil concentration of 34.2 μl L-1 air , the adult mortality was 94.65% while the egg mortality was 61.10% for an oil concentration of 26.7 μl L-1 air . The lowest values after 72 h were observed on adults of C. maculatus (Fab.) (4.01). The LC50 amount for eggs at this time was 16.98 μl L-1 air . Progeny was reduced by 57.76% after a 72 h exposure of oil at a concentration of 34.2 μl L-1 air. Fumigant effects of this essential oil were considered to warrant further research into their potential for commercial use.
  N. Haghtalab , N. Shayesteh and S. Aramideh
  Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) is a primary pest of cowpea and other legumes worldwide, both in fields and in stored seeds. Castor oil at 5, 6, 7, 8 and 9 mL kg-1 and Hazelnut at 2.8, 4.4, 6, 7.6 and 9.2 mL kg-1 were tested against C. maculatus in cowpea. All bioassays were conducted at 27±1°C and 65±5% r.h and mortality was counted after 24, 48 and 72 h of exposure. After the 72 h mortality count, all adults were removed and the vials were left at the same conditions for further 35 days to assess progeny production. The increase of dose and exposure interval increased mortality. After 72 h of exposure, mortality received to 80.83% on Hazelnut oil at high rate (9.2 mL kg-1). Mortality in the case of Castor oil was higher than Hazelnut and received to 86.66% at 9 mL kg-1. The lowest LC50 value on 72 h was observed in the Hazelnut (6.57 mL kg-1). In contrast, the lowest LC95 value on 72 h was observed in the Castor (l0.94 mL kg-1). Complete suppression in progeny production was achieved on cowpea treated with Castor oil at 9 mL kg-1 but in the all case, the percentage of reduced progeny received up to 90%. In conclusion, treatment of grain with vegetable oil could have important practical implications for parts of the world where pesticides are expensive or in short supply.
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