| Autor: |
G. V., Vishaka, M., Chandrashekharaiah, Nadaf, Hasansab, Rathore, M. S., Chowdary, N. B., K., Sathyanarayana |
| Předmět: |
|
| Zdroj: |
Plant Archives (09725210); 2022 Special Issue, p83-87, 5p |
| Abstrakt: |
In tasar sericulture, it is an established fact that many factors contribute to the growth and development of silkworms for production of quality eggs. In order to produce quality eggs, diapause tasar seed cocoons are preserved in grainage house. These preserved cocoons undergo various biotic and abiotic stresses. The abiotic factors, especially temperature and relative humidity influence moth emergence and egg laying. The silkworm being sensitive to environmental fluctuations and availability of congenial environmental conditions during preservation results in emergence of moths in unseason i.e. unseasonal emergence or erratic emergence and leading to preservation loss which has a direct bearing on egg/seed production. Hence, a study was conducted in the year 2022 at Bilaspur, Chhattisgarh to analyse the Daba TV tasar silk moth emergence pattern and its fecundity. The results revealed that the moths emerged erratically from January to May (2022) and a total number of 670 female moths and 932 male moths have emerged. Due to unsynchronized emergence of male and female moths, the coupling was 23 %. The coupled female moths were selected for oviposition whereas uncoupled moths were directly taken for dissection in order to analyse the mature eggs. In case of coupled female moth the average number of eggs laid on first day (24h), second day (48h) and third day (72h) was 58.60, 17.76 and 10.24 respectively. However, the average number of eggs retained in ovaries was 83.69. Ovulation was found to have a positive relation with fecundity and retention capacity. In case of uncoupled female moths the mature eggs in the ovaries was found to be very minimum (34.45 No.). Also observed that the formation of eggs in the ovaries was not normal and also in few cases no eggs (Nil) were recorded when the average temperature was >43°C with relative humidity <33 % and rainfall <10 mm. This indicated that higher temperature and lower relative humidity were detrimental for formation of eggs in the ovaries and the innate reproductive ability of tasar silk moth was interrupted due to extreme climatic factors. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
