The Insecticidal Activity of Neem and Palm Kernel Oils on Bean Weevil (Callosobruchus maculatus F.) (Coleoptera: Chrysomelidae: Bruchinae) Infestations of Stored Cowpea (Vigna unguiculata L. Walp)

Table 5

The sulfurous odour/bitterness level of the seeds treated with different dosage rates of the oils tested.

Sulfurous odour/bitterness level	Treatments	The dosage rates of tested oils
Low	1N2 : 3P2 and 1N1 : 3P1	10 ml neem+30 ml PKO at 2.0 ml and 10 ml neem+30 ml PKO at 1.0 ml
Moderate	1N2 : 2P2 and 1N1 : 2P1	10 ml neem+20 ml PKO at 2.0 ml; 10 ml neem+20 ml PKO at 1.0 ml
High	1N2 : 1P2 and 1N1 : 1P1	10 ml neem+10 ml PKO at 2.0 ml and 10 ml neem+10 ml PKO at 1.0 ml
Very high	N2 and N1	Neem at 2.0 ml and neem at 1.0 ml