Abstract:
Potato tubers (Solanum tubersom L.) attacked by some of soil insects
especially the larvae of Wireworms (Agriotes spp.), larvae of Black
Cutworm(Agrotis ipsilon) and Mol cricket (Gryllotalpa gryllotalpa (L.)
.The damage of these insect doesn’t observed in oftentimes until the tubers
pulling out. This study were conducted to evaluate the population density and
percent of infection according to crop growth stage of potato. The results
showed that the larvae of wireworms were accompanied the growth of crop in
autumnal form planting tubers at the second half of September until harvested in
the second half of January. The highest average number of larvae (2.4 larvae\
sample) were recorded at during October which synchronism with the first
growth stage (sprout development),and the percent infestation of tubers was
11.11 % .
In spring planting the highest average number of larvae (3.2 larvae/sample)
was recorded during April which synchronism with tuber initiation and the
percent of infestation was 14.13%.
The black cutworm was accompanied the Crop growth during the first fourth
stages only in autumnal planting.
The highest average number of larvae (1.4 larvae / sample) was recorded during
November when the crop was at tuber initiation .In spring planting the larvae of
cutworm escort crop from the second stage (vegetative growth) and even the
stage of maturation . The highest average number of larvae (2.4
larvae/sample)was recorded during April with 11.11 % infestation.
Sample methods did not succeed to estimate the population density of Mol
cricket, but their injures were recorded in the spring and autumn planting in the
all stages of plant growth and the highest percent of infestation was 22.22% in
spring planting during vegetation growth stage
