Does Adult Nutrition Affect Parasitizing Efficiency of Tetrastichus howardi (eulophidae: Hymenoptera) on Pupae of Sugarcane Stalk Borer, Chilo Auricilius Dudgeon?
Keywords:
Pupa, parasitoid, biology, nutrient, sugarcane borer. Stenobracon nicevillaeAbstract
The parasitizing efficiency of Tetrastichus howardi (Olliff) (Eulophidae: Hymenoptera) was studied at 26 ± 2oC and 65 ± 5% relative humidity in the laboratory on pupae of sugarcane stalk borer, Chilo auricilius Dudgeon (Crambidae: Lepidoptera) on different nutrients regimes. The number of progeny emerged from each pupa varied from 35.20 to 56.20 in different nutrition regimes. The provision of supplementary food (vit C) appeared to be an important factor for higher adult emergence. The percentage female emergence was maximum (90.66) in honey- water solution which is at par with vitamin E (87.88) and vitamin C (87.74) followed by solutions of stalk borer (85.48) and silkworm (82.24). The significantly higher percentage of female progeny was produced as compared to males in all nutrients tested. The availability of silkworm solution as a food source increased more male emergence (17.24) than other nutrients (10.34 to 14.52%). Providing the right nutrition from honeywater solution and vitamin C for T.howardi will enhance their biological activities during mass rearing and their efficiency throughout field release.
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