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Bioefficacy of Insecticides against Fruit Fly, Bactrocera dorsalis (Hendel) and their Residue in Guava Fruits

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Title Bioefficacy of Insecticides against Fruit Fly, Bactrocera dorsalis (Hendel) and their Residue in Guava Fruits
 
Creator Meenakshi Devi
 
Contributor Yadav, G.S.
 
Subject Sowing, Genotypes, Planting, Developmental stages, Yields, Environment, Animal husbandry, Genetics, Land resources, Biological phenomena
 
Description The study on “Bioefficacy of insecticides against fruit fly, Bactrocera dorsalis (Hendel) and their residue
in guava fruits” was done with the following objectives: (1) Study of the population dynamics of fruit fly on guava
(2) Evaluation of bio-efficacy of insecticides against fruit fly on guava. (3) Estimation of residue of insecticides in
guava fruits. The present study was conducted at the Research Area of Department of Horticulture and Pesticide
Residue Laboratory, Department of Entomology, CCS Haryana Agricultural University, Hisar. Four methyl
eugenol traps per acre were installed on the guava trees for observing the adult fruit fly population on guava trees
(var. Hisar Safeda). The peak activity of fruit fly population was recorded in 33
th
standard metrological week (28 /
trap) when average temperature was 31.4
0
C- 25.2
0
C (max.-min.), relative humidity 96.1%-81.5% (M-E) and
rainfall 25.7 mm.
The bioefficacy of malathion @ 625 g a.i. ha
-1
, spinosad @ 67.5 g a.i. ha
-1
, lambda - cyhalothrin @ 45 g
a.i. ha
-1
, imidacloprid @ 17.8 g a.i. ha
-1
, dimethoate @ 375 g a.i. ha
-1
and nimbecidine @ 3 ml / l of water against
fruit fly, Bactrocera dorsalis (Hendel) was investigated on guava trees. The first foliar spray of each treatment was
commenced at the fruit maturity stage when oviposition marks were noticed on guava fruits and second spray after
10 days. All the treatments were significantly better than the control. The maximum per cent reduction of
oviposition marks (81.81%) was recorded in nimbecidine 0.03% (T
6
) and minimum oviposition reduction
(54.83%) in malathion 50 EC (T
5
). Maximum oviposiption reduction (81.81%) was recorded in T
6
followed by
imidacloprid 17.8 SL (T
1
) (75%), respectively. The lowest number (0.25 / fruit) of maggots was also observed in
nimbecidine 0.03% treatment.
Recommended and double the recommended doses of two organophosphates and one synthetic
pyrethroid insecticide viz., dimethoate @ 375 and 750 g a.i. ha
-1
, lambda - cyhalothrin @ 45 and 90 g a.i. ha
-1
and
malathion 625 and 1250 g a.i. ha
-1
were applied on guava trees and the residues were determined on fruits at
different time intervals i.e. 0 (2h after spray), 3, 7 and 10 days after first and second spray. The initial deposits of
dimethoate 1.239 and 2.282 mg kg
-1
, lambda - cyhalothrin 0.009 and 0.019 mg kg
-1
and malathion 0.06 and 0.11
mg kg
-1
at both the doses. The half life values at single and double doses calculated were 6.72 and 8.15 days for
dimethoate, 4.41 and 4.71 days for lambda - cyhalothrin and 3.0 and 3.3 days for malathion. The residue levels
were found to be below MRL on 0 day for recommended dose of malathion (4.0 mg kg
-1
) and 3
rd
day for
dimethoate (2.0 mg kg
-1
) at double dose. Washing of dimethoate, lambda – cyhalothrin and malathion treated
guava fruits removed 42.93- 45.23%, 33.0-36.84% and 50.0-54.54% of the residues at zero day (on the day of
application).
 
Date 2016-09-17T08:46:17Z
2016-09-17T08:46:17Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/77159
 
Language en
 
Format application/pdf
 
Publisher CCSHAU