Control of the seed beetle Callosobruchus muculatus reared on chickpeas by different applicable conditions of the insect growth regulator, Cyromazine

Journal Article

2012

Efficiency of most pesticides is monitored by many factors such as the method of application, the
concentrations and the temperature. The study was aimed to investigate the optimal conditions for
using Insect Growth Regulator (IGR), cyromazine to control the Southern cowpea weevil
Callosobruchus muculatus Fab. (Bruchidae: Coleoptera). Interactions of the method of application and
concentrations of cyromazine together with temperatures significantly affected the reproductive rate of
C. muculatus. Accordingly, when seeds were completely embedded (dipping method) in 5% cyromazine
at 30°C, the insect reproductive rate was significantly decreased to 1.37%. In addition, results revealed
that the increase in cyromazine concentration simultaneously with the seed-dipping method clearly
decreased the consumption of food storage by the insect population. However, the generation lifespan
of the insect was increased. No significant change was observed in the percentage of the sexual ratio,
while a clear significant difference was recorded in the weights of the males and females. In conclusion,
the seed-embedding method with a high concentration (5%) of cyromazine at 30°C resulted in the most
significant food consumption with a clear reduction in the generation reproductive rate.