Population Dynamics and Management of Carpomyia vesuviana Costa on Ber, Ziziphus mauritiana (L.
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Date
2022
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Abstract
Investigations on “Population Dynamics and Management of
Carpomyia vesuviana Costa on Ber, Ziziphus mauritiana (L.)” were
carried out at Asalpur farm, S.K.N College of Agriculture, Jobner during
October, 2021 to March, 2022.
The Infestation of ber fruit fly on cultivar Gola started in the first
week of November and gradually increased and reached its peak in the
first week of February on number basis and in the third week of
January on weight basis. A non-significant negative correlation was
observed between infestation of fruit fly with maximum and minimum
temperature. The morning and evening relative humidity and rain fall
showed non-significant positive correlation with the incidence of fruit
fly. Wind velocity showed significant positive correlation with the
incidence of ber fruit fly.
A significant difference was found in marketable yield between
the protected and unprotected plots. The average fruit yield per tree of
protected plots was 52.13 kg per tree while the average fruit yield of
unprotected plots was 32.51 kg per tree. The loss in yield caused by
ber fruit fly was 37.61 per cent in unprotected trees as compared to
protected treeOut of seven biopesticides tested against ber fruit fly, revealed
that spinosad 45 SC 0.01% was found most effective followed by
azadirachtin 0.03 EC. The treatment of NSKE 5%, Beauveria bassiana
1.15 WP and Metarhizium anisopliae 1.15 WP existed in moderate
group of their efficacy however they were at par to each other. The
Neem oil and Karanj oil proved least effective against fruit fly.
All the biopesticide increased the marketable yield of ber fruits
significantly over the control. The maximum yield (41 kg/tree) was
recorded in the plot treated with spinosad 45 SC followed by
azadirachtin 0.03 EC (37 kg/tree), NSKE 5% (35.35 kg/tree), Beauveria
bassiana 1.15 WP (33 kg/tree) and Neem oil (32 kg/tree). The
minimum yield (31 kg/tree and 29.40 kg/tree) was recorded in
Metarhizium anisopliae 1.15 WP and Karanj oil. Maximum increase in
yield over control was recorded in the plot treated with spiosad 45 SC
(37.91%) followed by azadirachtin 0.03 EC (34.05%), NSKE 5%
(31.85%), Beauveria bassiana 1.15 WP (25.71%) and Neem oil
(22.48%). whereas, The minimum increase in yield over control was
found in Metarhizium anisopliae 1.15 WP (19.71%) and Karanj oil
(18.28%)
The highest incremental cost benefit ratio (ICBR) of 4.03 was
computed in spinosad followed by Beauveria bassiana (2.62),
azadirachtin (2.60), Neem oil (2.41) and NSKE (2.16). The lowest B:C
ratio 1.58 was obtained in Karanj oil and 2.0 Metarhizium anisopliae