EFFECT OF DIFFERENT TEMPEREATURE DEGREES ON THE STAGES DEVELOPMENT PERIODS OF WATERHYACINTH CHEVROUNE WEEVIL AND MOTTELD WATERHYACINTH WEEVIL | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 43, Issue 0, January 2013, Pages 1-7 | ||
| Authors | ||
| A.J. M. Al-Shammary; H.K. Al-Zubaidy | ||
| Abstract | ||
| This study was conducted to delermine the effect of different constant temperatures on the developmental stages. Results reveled no growth of the eggs at 15 and 35 °C while their incubation periods were 17.88,7.8 and 7.38 days at 20, 25 and 30 °C successively. while 35.56, 32.25 and 30.81 for the larvae, and 31.16, 29.48 and 29.23 days for the pupae at the same temperatures successively. Results also showed that the life time of males was variant being 7, 31.24, 30.8, 29.27 and 5.53 days while 8, 33.53, 32.53, 31.73 and 6.8 days for females when grown at the wnstant temperature 15, 20, 25, 30, 35°C successively. Results also showed that the preperiod of the eggs were different being 9,4.6 and 3.2 days at 20, 25 and 30 °C successively. While the generation time was 93.6, 74.13 and 70.62 at the same temperatures tested successively. while the growth developmental time of N. eichhorniae for eggs, larvae and pupae were zero at 15 and 35 °C while the incubation period of eggs were 14.33, 8.86 and 7.8 days at 20, 25 and 30 °C successively. The developmental time of larvae was 73.4, 70.52 and 57.75 days at the same temperatures successively, while 27.38, 17.47 and 15.13 days for the pupae at the same temperatures successively. Results also showed that the life time of males was variant being 5.87, 20.13, 33.93, 39.93 and 5.2 when grown at the instants temperature 15, 20, 25, 30, 35°C successively while it was 8.87, 23.13, 34.4, 42.67 and 7.07 days for female at the same temperatures successively . Results also showed that the pre period of the eggs were 9.8, 5.2 and 5 days at 20, 25 and 30 °C successively. While the generation time was 124.91,102.05 and 85.65 at the same temperatures successively. | ||
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