Thesis

"Experiments were conducted to study the storability and field spray of botanicals on mulberry and its effect on silkworm economic traits. The storability of aqueous extract of Parthenium hysterophorus (20%) and Tridax procumbens (30%) was studied in normal, refrigerator and earthen pot storage for 1, 3, 5, 10 and 15 days. The extract of Parthenium and Tridax stored in refrigerator has recorded highest larval weight (36.59 g), cocoon weight (16.58 g), shell weight (2.72 g), pupal weight (14.36 g), cocoon shell ratio (18.35%), filament length (821 m), effective rate of rearing (78.80%) and cocoon yield (10.32 kg/25 dfl). It was followed by earthen pot and normal storage. Further, storing the Parthenium and Tridax extract upto fifteen days in refrigerator and earthen pot and one day in normal storage has recorded maximum larval weight (37.33, 36.73 and 34.78 g), cocoon weight (16.97, 16.09 and 15.51 g), shell weight (2.79, 2.70 and 2.70 g), c/s ratio (18.68, 18.30 and 17.41%), pupal weight (13.91, 13.11 and 12.86 g), filament length (871, 781 and 699 m), denier (2.30, 2.04 and 2.50), ERR (83.00, 77.80 and 70.70%), fecundity (549, 515 and 472), hatching (97.80, 97.10 and 96.90%) and cocoon yield/25dfl (10.81, 9.98 and 8.34 kg) respectively. Supplementation of aqueous extract of Parthenium (20%) and Tridax (30%) were found to be statistically on par and recorded maximum larval weight (34.90 and 34.69 g), cocoon weight (15.65 and 15.99 g), shell weight (2.65 and 2.62 g), pupal weight (12.83 and 13.05 g), cocoon shell ratio (18.00 and 17.60%), filament length (745 and 729 m), denier (2.45 and 2.47), ERR (72.90 and 75.30%), fecundit}- (514 and 484), hatching (95.80 and 96.10%) and cocoon yield (9.18 and 9.99 kg/25dfl) respectively as compared to water and absolute control. Irrespective of rearing season field spraying of aqueous extract of Lantana camara (30%) recorded significantly highest matured larval weight (31.13 g), cocoon weight (15.58 g), denier (2.72) and cocoon yield (11.68 kg/25dfl). While Parthenium hysterophous (30%) was superior in shell weight (2.90 g), cocoon shell ratio (19.52%), filament length (775.67 m), fecundity (534) and hatching (91.44%). Among the season, the botanicals were found to be significantly superior during rainy as compared to winter and summer. During rainy season the larval weight (32.88 g), ERR (77.88%), cocoon weight (16.73 g), pupal weight (13.52 g), filament length (755 m), fecundity (537) and cocoon yield (13.31 kg/25dfl) were superior over other rainy seasons."

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