“Key Informant Survey” of Production, Value, Losses and ... - DfID

B. correcta Guava Tamil Nadu Sarada et al. 2001 Studies of population fluctuations of the guava fruit fly, B. correcta, were conducted in guava
orchards in Tamil Nadu from May 1994 to September 1995 using methyl eugenol traps. A distinct
population peak, which coincided with the ripening, was recorded from July to August in both years.
Abiotic factors played an important role in regulating B. correcta population. Data on weekly catch
when correlated with weather parameters showed significant positive correlation with mean
maximum temperature (r=0.3314), minimum temperature (r=0.3610), day-degrees (thermal units)
(r=0.3692), morning relative humidity (r=0.4369) and rainfall (r=0.2364). Weekly mean sunshine
hours had low negative correlation with the catch.
B. dorsalis, B.
correcta, B.
zonata
Mango Tirupati, Andhra
Pradesh
Sarada et al. 2001 An experiment was conducted in a mango orchard to evaluate the different coloured plastic open
pan traps viz., yellow, white, blue, orange, red and green as attractants for fruit flies such as B.
dorsalis, B. correcta and B. zonata in three replications at Tirupati, Andhra Pradesh, during 2000.
During the same year another two experiments were conducted with these open pan traps by
placing them at different heights (0, 1.0, 1.5 and 2.0 metres) above the ground and at different
locations in the orchard. An open pan of 60 cm diameter with 7.5 cm depth, along with 0.1% methyl
eugenol attractant was used for the purpose. Significantly more flies were attracted to white
(16.953 flies/trap) and yellow (15.317 flies/trap) coloured traps followed by green, orange, red and
blue, respectively. Lowest number of flies were attracted to blue colour. Traps placed on the ground
caught significantly most flies (12.433 flies/trap), followed by 1.0m, 2.0m and 1.5m, respectively.
Traps in the periphery of the orchard attracted more flies (945 flies) than traps in the centre (561
flies).
B. dorsalis Guava Karnataka Shukla and Prasad 1985 Abiotic factors played an important role in regulating the fly population. Trap catches were
significantly and positively correlated with maximum and minimum temperatures day degrees and
maximum relative humidity.Trap catches were significantly and negatively correlated with minimum
relative humidity.
B. dorsalis Mango Pantnagar, Uttar Singh et al. 1997 Methyl eugenol (0.2%) was used to bait 4 traps/acre for 18 weeks (2nd April to 30th July). The
Pradesh
largest trap catches of 233 males/week occurred between 18 June and 25 June.
B. cucurbitae Sood and Nath 1998 An analysis of the seasonal variation in adult sex ratios in a population of B. cucurbitae indicated
that the ratios were female biased (1:1.23, 1.15 and 1.29) during the spring, autumn and winter
seasons, respectively, but not during summer. However, Chi-square analysis did not indicate any
significant departure from a 1:1 ratio during different seasons. Possible reasons for a deviation of
the sex ratio from the expected 1:1 are also discussed.
Integrated Management of Fruit Flies in India: Knowledge Review 38 of 110