Bull. Spec. CORESTA Congress, Lisbon, 2000, p. 140, PPOST8

Bio-intensive integrated management of budworm, Helicoverpa armigera in FCV tobacco

Central Tobacco Research Institute (CTRI), Rajahmundry (A.P.) India
Tobacco budworm, Helicoverpa armigera , is one of the limiting factors in successful production of Flue Cured Virginia (FCV) tobacco in Andhra Pradesh, India. It infests the crop during the grand growth period and inflicts severe damage to the bud leaves resulting in heavy loss to the farmers. Use of chemical insecticides has been the main stay to control the pest and a shift is required to get over the undesirable side effects that crop up due to the sole dependance on chemical control. A bio-intensive IPM (BIPM) module with components of Tagetes Sp. as trap crop, erection of bird perches and foliar spray of Ha NPV @ 4.5 x 1012 PIBs/ha and hand picking of grown up larvae was developed and compared with chemical control (CC) and farmers method (FM) of control for two seasons. Observations on pest infestation and plant damage in FCV tobacco in BIPM, CC and FM plots were recorded. Pest incidence and natural enemy activity on trap crop was also recorded in BIPM plot. Data on yield parameters were collected from all the three plots and CB ratios were calculated. The results revealed that BIPM and chemical control were equally effective and gave significantly better protection to tobacco plants from bud worm damage as shown by mean number of H. armigera at 30, 40, and 50 days after planting than farmers method of control. The data on natural enemy population indicated that Tagetes Sp. served as a reservoir for parasitoids and predators. Data on yield parameters indicated that the increase of green leaf in CC plot was 2.20% over BIPM plot, while increase of cured leaf, bright leaf and grade index in BIPM plot was 2.61, 5.58 and 4.34% respectively over chemical control with a mean CB ratio of 1:2.56 in BIPM plot and 1:2.41 in chemical control plot. Thus BIPM proved to be effective in controlling budworm on FCV tobacco, proved to be economical and environmentally safe as compared to chemical control.