| dc.description | Mango, Mangifera indica L. is one of the king of fruits of the world
(Butani, 1979). It is the most popular fruit among millions of people in the
orient and has a great economic importance in tropical and sub-tropical
regions (Mondal et al., 2004). It is considered to be the choicest of all
indigenous fruit (Singh, 1960). It is also one of the important fruits in
Bangladesh. It tops the list and second in terms of production among the
fruits in Bangladesh. It is grown under a tropical and sub-tropical climate
in all parts of the country, but production of quality mango is confined to
the northwestern part of Bangladesh, particularly in the districts of greater
Rajshahi and Dinajpur (Matin et al., 2006). There is perhaps no fruit other
than ripe mango that contains 2743 mg of carotene, the precursor of
vitamin A. Both unripe and ripe mangoes are a good source of vitamin C
(ascorbic acid 16 mg) (Hossain, 1989). | en_US |
| dc.description.abstract | A study was undertaken to observe the biology and leaf consumption of
mango defoliator, Cricula trifenestrata Helfer in the laboratory,
Department of Entomology, Hajee Mohammad Danesh Science and
lechnology University (HS1U), Dinajpur during the period of April to
July, 2007 at 25 + 2°C and 75 = 5 % RH (at room temperature and
humidity). The results of biology reveal that the prc-oviposition,
OViposition and incubation period of the mango defoliator were 2.3, 0.5
and 8.7 days, respectively. The average number of eggs laid by a female
was 141.70 and the hatching rate was 88.81 %. The mean duration of the
first, second, third, fourth and the final instar larvae were 5.30, 5.10, 6.10,
5.80 and 6.20 days, respectively. The mean duration of pre-pupa and pupa
were 2.50 and 19.55 days. The average longevity of male and female
moths was 2.90 and 4.20 days, respectively. The average total
developmental periods from egg to adult were 59.2 days. The
morphological data show that the average length and breadth of eggs were
2.27 and 1.86 mm, respectively. The mean length and breadth of 1°, 274,
3 4" and 5" instar larvae were 4.08, 13.90, 30.09, 61.37, 81.49 and 2.17,
5.09, 7.23, 11.22, 15.51 mm, respectively. The average length and breadth
of male and female cocoons were 41.98, 50.89 and 12.31, 16.22 mm
whereas the Iength and breadth of male and female pupae were 31.64,
35.57 and 10.61, 12.58 mm, respectively. The average length and breadth
of male and female moths were 22.35, 32.48 and 32.02, 74.14 mm,
respectively. The data of the feeding behaviour reveal that 1°, 2°", 3", 4”
and 5" instar larvae consumed 10.5, 20.7, 85.3, 415.6 and 650.3 cm” or
0.50, 1.20, 2.80, 8.50 and 16.40 g leaves, respectively. A larva consumed
1164.45 cm’ or 27.2 g leaf during its developmental period and the result
shows that the final instar larvae consumed the highest amount of leaf. | en_US |
