H. Rashid
Scientific Officer
ARS, Burirhat, Rangpur.
S. N. Alam
Chief Scientific Officer
Entomology Division, BARI, Gazipur,
M. A. Mannaf
Chief Scientific Officer
ARS, Burirhat, Rangpur
The experiment was conducted at Agricultural Research Station, Burirhat, Rangpur during 2012-2013 cropping season to know the seasonal fluctuation of mite pests in brinjal and chilli. In brinjal, the mite infestation was first noticed on 3rd week of December (0.2 mite/leaf) and then there was a gradual increase in mite population. Peak mite population in brinjal (8.27 per leaf) was noticed on 2nd week of April and then declined sharply due to rain. In chilli, the mite infestation was also first noticed on 3rd week of December and gradually incresed reaching its peak (3.67mites/leaf) on 2nd week of February. After that period the mite population showed sharp declinig trend. Maximum and minimum temperatures showed significant positive correlation with mite population in brinjal and chilli. Maximum and minimum relative humidity showed significant negative correlation with mite population in brinjal and chilli. Rainfall showed negative correlation with mite population but the relationship was non-significant.
mite , seasonal fluction, infestation, brinjal, chilli
ARS, Burirhat, Rangpur
Pest Management
To know the seasonal population fluctuation of mite pests in brinjal and chilli.
The experiment was conducted at Agricultural Research Station, Burirhat, Rangpur during 2012-2013 cropping season to know the seasonal population fluctuation of mite pests in brinjal and chilli. Crops were raised as per the recommended agronomic practices. Insect pests were managed with chemical means before the appearance of mites and later by non chemical measures. All crops were monitored regularly for the incidence of mites. For sampling, five plants were randomly selected in each crop. Three leaves covering top, middle and bottom canopy of brinjal and chilli were sampled separately and observed under stereo binocular microscope. The meteorological parameters viz. temperature, relative humidity and rainfall were also recorded during the study period. The mean values of previous 7 days data of the above parameters were computed for 7th days of observations.
Annual report, 2012-2013, Entomology Division, BARI, Gazipur
40,000.00
In brinjal, the mite infestation was first noticed on 3rd week of December (0.2 mite/leaf) and then there was a gradual increase in mite population. Peak mite population in brinjal (8.27 per leaf) was noticed on 2nd week of April and then declined sharply due to rain. In chilli, the mite infestation was also first noticed on 3rd week of December and gradually increased reaching its peak (3.67mites/leaf) on 2nd week of February. After that period the mite population showed sharp declining trend. Maximum and minimum temperatures showed significant positive correlation with mite population in brinjal and chilli. Maximum and minimum relative humidity showed significant negative correlation with mite population in brinjal and chilli. Rainfall showed negative correlation with mite population but the relationship was non-significant.