Study the life aspects of Eriasinsulana Boisd on some of the marshmallow family crops

Abstract

Based on the importance of cotton crops Gossypium spp., Abelmoschus esculentus and Hibiscus sabdrriffa in Iraq, and because of damage caused by Eriasinsulana boisd cotton worm for these crops, Life data that helps to explain the persistence of this insect as a pest threatening the marshmallow family crops was studied and the main points for the development of effective control programs against it.The results of the laboratory study showed that all the life aspects of the insect were affected during the breeding of different plant families (cotton, okra, hibiscus). The shorter duration of larvae development was 16.27 days and the mean weight was 0.28 g when it was raised on the hibiscus plant and its length was 22.35 days and the highest rate was 0.35 g (18.42 days) and the average weight (0.32 g) on the okra. The highest survival rate was 57% for cotton, while the lowest for the hibiscus plant was 42%. The study showed that the host had an effect on the average period of development of pupa and adult females, with the highest rate of 12.35 and 55.17 days on cotton and the lowest rate of 10.75 and 31.37 days on the hibiscus, respectively. 0.31 and 0.27 g respectively on cotton, while 0.27 and 0.21 g respectively fell on the hibiscus. In terms of the average pre-laying period, the highest rate was 6.24 days on the hibiscus plant, corresponding to 3.89 days on cotton and 5.21 days on the okra, The longest period of laying the eggs was 42.12 days on the cotton, while at least 17.93 days on the hibiscus. The adult insect had the largest number of eggs fed on cotton (75.16 eggs / female) while the lowest number when feeding on the hibiscus (43.3) eggs / female. The results of the study showed that the highest rate of post-ovulation period for the female insect was 3.25 days on the hibiscus and decreased to the lowest rate (2.00 days) on the cotton.It is concluded that the growth and development of the insect was optimal for feeding on cotton.