Latest Issue
ISSN : 2456-8643

Title:
THRESHING METHOD-CAUSED DAMAGE TO SEEDS OF MAIZE AND VARIATION OF THE SEEDS' SUSCEPTIBILITY TO (Sitophilus zeamais )STORAGE INSECT PEST

Authors:
D.G. Msuya , Tanzania

Abstract:
Varying damage levels occur in maize during threshing. An experiment was conducted to establish maize threshing-caused damage to kernels and subsequent seeds’ susceptibility to storage insects. Kernels threshed by: machine, beating with stick, or pressing with fingers were assessed for broken kernels, physiological performance with storage time, and hosting of Sitophilus zeamais storage pest. Mechanical threshing or beating with stick both caused kernel breakage. Beating with stick caused less damage than mechanized threshing in number of broken kernel pieces and broken whole kernels (P<0.01). Seeds stored for two months and beyonds’ germination capacities were lower (P<0.05) in machine-threshed than in seeds threshed by fingers. The physiological influence during storage was partly due to storage insect pests rather than threshing caused damage alone. After 2 and 3 months, number of S. zeamais in mechanized threshing was statistically larger than in fingers threshed grains. Percent normal seedlings was low in all threshing methods insecticide-untreated samples at two months of storage; significantly lower than percentages for treated samples. Mean germination time was significantly positively correlated with number of broken kernel pieces and the number of storage insect counted in the samples; which means the two kernel damage attributes suppressed seed vigour.

PDF Download