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

Mango, guava Tirupati, Andhra
Pradesh
Jalaluddin and
Sarada
B. dorsalis Mango Karnataka Jayanthi and
Verghese
2001 Experiments on the seasonal abundance and population dynamics of fruit flies (Bactrocera spp.)
were conducted in orchards located in Tirupati, Andhra Pradesh, India from September 1999 to
March 2000 (guava), and from February to July 2000 (mango). The peak fly population in the
mango orchard was observed from May to July, coinciding with the fruit maturity period. The lowest
population was recorded in February (34 flies), while the highest population was observed in July
2000 (235 flies). The fly population was positively correlated with minimum temperature and
rainfall, and negatively correlated with the relative humidity. In the guava orchard, the highest
(223.5 flies) and lowest (11.0 flies) populations were recorded during November 1999 and March
2000, respectively. The fly population in the guava orchard was positively correlated with the
relative humidity and rainfall, while it was negatively correlated with the maximum temperature.
1998 Hourly fluctuations in trap catch (baited with methyl eugenol + carbaryl) of B. dorsalis in a mango
orchard in Karnataka were monitored. Catches were maximum in the afternoon, with a peak
between 16.00 and 17.00h. There were no catches between 19.00 and 06.00h.
B. correcta Mango, sapota Gujarat Kumar et al. 1997 In a field study in 1992-94 in Gujarat in mango and sapota [Manilkara zapota, sapodilla] orchards,
the seasonal activity of B. correcta was examined using traps baited with methyl eugenol. B.
correcta were trapped throughout the year in the mango and sapota orchards. In mango orchards,
trappings peaked during the second fortnight of April (453 fruit flies/trap) and the second fortnight of
May (483 fruit flies/trap). Major activity of the pest occurred from March to June, coinciding with the
fruiting period. The pest activity was positively correlated with temperature (maximum, minimum
and average). Other environmental factors did not have any significant impact. In sapota orchards,
the pest activity coincided with the fruiting period during April to September. The trappings peaked
during the first fortnight of June (580 fruit flies/trap). The pest activity was positively correlated with
temperature (minimum and average), relative humidity (evening and average) and negatively with
sunshine hours.
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