M.M. Kamal,
Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra
M.M. Hossain
Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra
R. U. Shamim
Chief Scientific Officer
Regional Agricultural Research Station,BARI, AkbaBograrpur
D Sarker
Principal Scientific Officer
Entomology Division,BARI, Gazipur
S N Alam
Chief Scientific Officer
Entomology Division,BARI, Gazipur
A field experiment was conducted during kharif 2011-12 at SRC, Bogra to determine the insect responsible for gall formation and its abundance in bay leaf (Cinnamomum tamala). There was an increase in gall formation from the first week of March to last week of April when new leaf flash was 11%-39%. There was a positive correlation between new flash of leaves with formation of new gall. During the study period, it was observed that galls formed only underside of new leaves. Gall shape was globular and green to pale green colored found on the surface of gall body. The middle canopy (47.64%) was highly gall infested due to presence of more number of new leaves in that canopy followed by upper canopy (38.80%) and lower canopy (15.36%). Probably the galls on bay leaf were formed by eriophyid (Acarina: Eriophyidae) mite. Some other associated insects namely parasitic hymenoptera wasps, scale insect, cecidomyidae gall insect, jumping plant louse and some fly maggots also observed inside the galls.
BAYLEAF, GALL, FORM, INSECT.
Spices Research Center,BARI, Shibganj, Bogra
Variety and Species
For documentation of infestation status of the leaf gall insect of bay leaf.
A field study was conducted at SRC, Bogra during rabi 2011- 2012 on bay leaf gall formation and gall incidence. For this experiment nine medium sized (about 10-12 years old plant) bay leaf plants were selected for observation and data collection. Data were taken from five (5) randomly selected twigs of each selected plants in every 7 days interval. Healthy and infested leaves were counted from each randomly selected twig. Finally data were converted into percentage. Infested leaves were collected and numbers of galls were counted from 1cm2 of each leaves. Some galls were collected and dissected to learn the causal factor and the number of individuals in the gall. Infestation data of different canopy levels was also recorded. All data were collected from five observations and replicated three times.
Spice Research Report 2011-12, Spice Research Centre, BARI, Shibganj, Bogra
The above study it is revealed that gall formation occured only on new leaves and possibly eriophyidae mite was responsible for gall formation on bay leaf and there was also some associated insects observed in this study which were not yet identified. It was first year study. So, for concrete findings it needs further study for the coming year.
Journal, Report/Proceedings