The morphology of larva, pupa, and adult were studied in the laboratory at Hill Agricultural Research Station ( HARS) , Khagrachari from May to October 1992. Borer infested guava fruits (Kazipiara) were collected from 0.5 hectare guava garden and carried to the laboratory ,Several infested fruits were dissected and observed borer of different stages inside the fruits. Among them ,ten full grown larvae were collected randomly and their length ,breadth, colour, and other morphological characters were recorded. Twenty-five infested fruits were kept in the rearing box until the larva came out the fruits for pupation. Ten full grown larvae were random collected from the box and transferred to petridishes for pupation. The bottom of the petridishes were covered with white blotting paper. Length, breadth, and colour of pupae, and pupal duration were recorded. The pupae were reared in the laboratory until the adult emergence. The male and female butterflies were identified by their colour and size. The length and breadth of the body and wing expanse were measured for both the sexes. The longevity of the male and female butterflies were also recorded. Control measures for the V. Isocrates F. The guava variety Kazipiara (6 years old plant) was used in this experiment for its high infestation rate. Guava saplings were planted in 4 m + 4 m in contour lines. One plant was considered as one treatment replication. Each treated plant was separated from the other by keeping untreated plants in between. The treatments were assigned as follows; (1) use of poly ethane bags for covering the immature fruits (marble size) as barrier , (2) spraying fruits with Malathion 57 EC @ 2ml/l of water , (3) Diazinon 60 EC @ 2ml/l of water ,(4) Nogos 100 EC @ lml/l of water, (5) Ripcord 10 EC @ lml/l of water, and (6) untreated control with water spray only. The polyethene bag used as barrier was 20cm+15 cm with two holes (0.5 cm dia ) at the bottom to facilitate aeration and drainage of any accumulated water. Sixty randomly selected marble sized ( 1.5 to 2.0 cm din) fruits were covered with polyethenc bags for the purpose.Treatments (2), (3), (4), (5), and (6) were applied at the same stage of fruit and a total of 4 sprays were applied at an interval of 15 days during the period from 1 june to 15 july 1993. A high volume and low pressure Knapsack sprayer (Asha) was used for spraying insecticides or water. The spraying was done as a full cover (covering leaves, fruits, branches, and the trunk of a tree) to the point of ran-off. Date were recorded at an interval of 7 days , starting from 29 july and continued up to 23 September 1993. Number and weight of healthy and infested fruits were recorded for each treatment and for each plant at harvest. The morphology of larva, pupa, and adult were studied in the laboratory at Hill Agricultural Research Station ( HARS) , Khagrachari from May to October 1992. Borer infested guava fruits (Kazipiara) were collected from 0.5 hectare guava garden and carried to the laboratory ,Several infested fruits were dissected and observed borer of different stages inside the fruits. Among them ,ten full grown larvae were collected randomly and their length ,breadth, colour, and other morphological characters were recorded. Twenty-five infested fruits were kept in the rearing box until the larvas came out the fruits for pupation. Ten full grown larvae were random collected from the box and transferred to petridishes for pupation. The bottom of the petridishes were covered with white blotting paper. Length, breadth, and colour of pupae, and pupal duration were recorded. The pupae were reared in the laboratory until the adult emergence. The male and female butterflies were identified by their colour and size. The length and breadth of the body and wing expanse were measured for both the sexes. The longevity of the male and female butterflies were also recorded. Control measures for the V. Isocrates F. The guava variety Kazipiara (6 years old plant) was used in this experiment for its high infestation rate. Guava saplings were planted in 4 m + 4 m in contour lines. One plant was considered as one treatment replication. Each treated plant was separated from the other by keeping untreated plants in between. The treatments were assigned as follows;
(1) use of poly ethane bags for covering the immature fruits (marble size) as barrier , (2) spraying fruits with Malathion 57 EC @ 2ml/l of water , (3) Diazinon 60 EC @ 2ml/l of water ,(4) Nogos 100 EC @ lml/l of water, (5) Ripcord 10 EC @ lml/l of water, and (6) untreated control with water spray only. The polyethene bag used as barrier was 20cm+15 cm with two holes (0.5 cm dia ) at the bottom to facilitate aeration and drainage of any accumulated water. Sixty randomly selected marble sized ( 1.5 to 2.0 cm din) fruits were covered with polyethene bags for the purpose.Treatments (2), (3), (4), (5), and (6) were applied at the same stage of fruit and a total of 4 sprays were applied at an interval of 15 days during the period from 1 june to 15 July 1993. A high volume and low pressure Knapsack sprayer (Asha) was used for spraying insecticides or water. The spraying was done as a full cover (covering leaves, fruits, branches, and the trunk of a tree) to the point of ran-off. Date were recorded at an interval of 7 days , starting from 29 July and continued up to 23 September 1993. Number and weight of healthy and infested fruits were recorded for each treatment and for each plant at harvest.