SEASONAL INCIDENCE, VARIETAL SCREENING AND MANAGEMENT OF FRUIT FLY INFESTING GUAVA (Psidium guajava L.) THROUGH FRUIT FLY TRAPS 3740
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Date
2023-08
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JAU JUNAGADH
Abstract
A field experiment entitled “Seasonal incidence, varietal screening and
management of fruit fly infesting guava (Psidium guajava L.) through methyl eugenol
traps” was conducted at Fruit Research Station, Sakkar Baug and Fruit Research
Station, Madhadi baug, Junagadh agricultural university from June 2022 to December
2022.
Incidence of the guava fruit fly was recorded standard meteorological week wise
throughout the course of the investigation. The fruit fly population was recorded from
the 23rd standard meteorological week to the 52nd standard meteorological week and the
frequency of population was recorded from 10.00 to 865.13 fruit flies per trap. The peak
incidence of fruit fly was recorded at 35th SMW which was 865.13 fruit flies per trap.
On the other hand, the lowest population of fruit fly (10.00 fruit flies/trap) was recorded
at 52nd SMW. Furthermore, the maximum activity of fruit fly was remained throughout
August month with 800.31 fruit flies per trap and the minimum activity of fruit fly was
observed during the December month with 21.12 fruit flies per trap.
The effects of various weather parameters on the fluctuation of the fruit fly
population on guava indicated that the population of fruit fly had a highly significant
positive correlation with evening humidity (r = 0.670), morning humidity (r = 0.669)
and minimum temperature (r = 0.522). While, wind speed (r = 0.216) and rainfall (r =
0.293) were also found positively correlated but it was non significant to the fruit fly
population. Temperature fluctuation (r = -0.696), relative humidity fluctuation (r = -
0.616), bright sunshine hours (r = -0.486) and evaporation (r = -0.483) had a highly
significant negative correlation with fruit fly population. Furthermore, maximum
temperature (r = -0.362) had a significant negative correlation with the fruit fly
population.
Susceptibility of guava varieties/genotype based on the number of oviposition
marks and infected fruits revealed that the lowest fruit fly infestation was observed in
the variety Lalit with 3.98 oviposition marks per fruit and 1.15 infected fruits followed
by the variety Shweta (4.88 oviposition marks and 1.23 infected fruits). On the other
hand, the highest fruit fly infestation was recorded on the variety Sarangpur selection
with 12.27 oviposition marks and 2.73 infected fruits followed by the variety
Bhavnagar local with 10.85 oviposition marks and 2.23 infected fruits. While moderate
fruit fly damage was noted in the variety Lucknow – 49 (6.62 oviposition marks and
1.56 infected fruits) and Allahabad safeda with 8.76 oviposition marks1.80 infected
fruits.
Furthermore, when these varieties/genotypes were compared and categorized
based on the number of oviposition marks and infected fruits, it revealed that the variety
Lalit and the variety Shweta were found as resistant variety to fruit fly infestation. The
variety Lucknow – 49 was found to be a moderately resistant variety. On the contrary,
the variety Sarangpur selection was found to be susceptible variety to fruit fly
infestation. While, two varieties were found as moderately susceptible variety which
were Allahabad safeda and Bhavnagar local.
Treatment incorporating 4 ml methyl eugenol + 6 ml ethanol + 1 ml spinosad
45 EC recorded the highest effectiveness with catches recorded an average of 141.72
fruit flies per trap. The second most effective treatment was the treatment containing 4
ml methyl eugenol + 6 ml ethanol + 1 ml spinetoram 11.7 SC with an average of 126.45
fruit flies per trap. On the contrary, the least effectiveness was observed in the treatment
utilizing 4 ml methyl eugenol + 6 ml ethanol + 1 ml chlorpyriphos 50 + cypermethrin
5 EC with mere catches of 12.97 fruit flies per trap. However, this effectiveness was
found to be statistically at par with the treatment containing 4 ml methyl eugenol + 6
ml ethanol + 1 ml chlorpyriphos 20 EC with mere catches of 14.44 fruit flies per trap