Control of all stages of the cowpea seed beetle Callosobruchus maculates (Coleoptera : Chrysomelidae)‎ by low temperature inside different bags

Abstract EN

Cooling and freezing is one of the means of physical insect control.

Low temperature was evaluated for disinfestations all stages of the cowpea seed beetle, Callosobruchus maculatus (Fabricius) (Coleoptera: Chrysomelidae ) in cowpea seeds.

Eggs, larvae, pupae and adults were exposed to temperature degrees; 5, 0, -5, and -10 ℃ kept inside different packages (plastic vial, plastic sack and glass jar) for various durations (1, 2, 4, 6, 8, 10, 12, 24 and 48 hrs.).

Results showed that the adults were the most cold-tolerant while the eggs were lowest cold-tolerant.

Packages were significantly different in adults stages and in larvae stages but in eggs and pupae not significantly different between packages.

LT90 of adults were 313.18, 42.22, 13.82 and 5.75 hrs.

For plastic sack at 5, 0, -5 and -10 ℃, respectively.

For eggs LT90 recorded 19.64,10.55, 4.06 and 2.43 hrs.

at 5, 0, -5 and -10 ℃, respectively, for plastic sack.

Larvae and pupae also recorded.