STUDIES ON THE PREDATION POTENTIAL OF COCCINELLA SEPTEMPUNCTATA (LINN.) ON THE PREY: MUSTARD APHIDS (LIPAPHIS ERYSIMI KALT.) AND UTILIZATION OF FOOD
Indu1, Usha Saxena, Surendra Kumar2 and V.C. Chatterjee
P.G. Department of Zoology., M.S. College, Sharanpur.
1Govt. Girls Degree College., Behat, Sharanpur
2Govt. Raza P.G. College, Rampur.
Predation potential of Cocinella septempunctata Linn. has been observed in the laboratory which shows seasonal variation and is synchronized with the availability of the prey, aphids (Lipaphis erysimi Kalt.) and reproductive cycle of the beetle. Numerically, the member of aphids predated upon by C. septempunctata Linn. is maximum in July and minimum in January by larval and adult stages. Females devour more aphids than male due to her egg bearing capacity. Weight gain after starved beetles fed indicates utilization of food. Lady beetle is attracted towards prey aphids from average distance of 3 to 5mm.
Keywords: Predation, Cocinella septempunctata, seasonal variation, aphids, egg, larvae, pupa