BIOLOGY AND MANAGEMENT OF CABBAGE BUTTERFLY (Pieris brassicae L.) ON CAULIFLOWER CROP
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Date
2018-10
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UHF, NAUNI
Abstract
ABSTRACT
The present studies on “Biology and management of cabbage butterfly (Pieris brassicae L.) on
cauliflower crop.” was carried out in the Department of Entomology, College of Horticulture on
cauliflower crop. The indices of cabbage butterfly under field conditions revealed that the eggs were
first recorded on February 8 during 2018, the peak egg count of 28.4/10 plants was found on February
16, whereas no eggs were recorded after 24 April, 2018. However, the larvae were first recorded on
February 12 during 2018, the peak larval count of 26.2 larvae/10 plants were recrded on February 20,
whereas no larva was found after the 28 April, 2018. Studies on biology of the P. brassicae revealed
that the pest passed through 4 stages viz., egg, larva, pupa and adult. Eggs hatched in 3-7 days with an
average duration of 4.40±0.37 days. It had five larval instars. The mean duration of the first, second,
third, fourth and fifth larval instar was 3.20±0.20 days, 3.50±0.17 days, 4.00±0.30 days, 4.40±0.16
days and 4.00±0.26 days respectively. The mean pupal period and the total development period (from
egg to adult emergence) was 12.20±0.25 days and 35.90±1.07 days, respectively. Life fertility table
was constructed on cauliflower and different fertility parameters were calculated, which revealed that
the values of the gross reproductive rate (GRR) and the net reproductive rate (Ro) of P. brassicae were
120.38 and 67.87 female eggs/female, respectively. The approximate generation time (Tc) was 39.05
days and the innate capacity of natural increase (rc) was 0.1080 female/female/day. The arbitrary
value of rc was used to determine the true intrinsic rate of increase (rm) graphically which was found to
be 0.1082. The finite rate of increase (λ) was 1.11 females/day, while the true generation time (T) was
38.98 days. The doubling time of P. brassicae on cauliflower was 6.41 days and the weekly
multiplication rate was found to be 2.13 days. Six pesticides viz., Malathion, Bacillus thuringiensis
(Bt.), Beauveria bassiana, neem seed kernel extract, drake seed extract and jeevamrit were evaluated
for their efficacy against the larvae of the cabbage butterfly on cauliflower crop under field
conditions. The order of effectiveness of treatments based on mortality of the larvae was Malathion
(0.1%) > Malathion (0.05%) > Bacillus thuringensis (0.2%) > Bacillus thuringensis (0.1%) >
Beauveria bassiana (2.0%) > Neem seed kernel extract (8.0%) > Beauveria bassiana (1.0%) > Neem
seed kernel extract (4.0%) > Drake seed extract (10%) > Jeevamrit (20%), Drake seed extract (5.0%)
> Jeevamrit (10%), respectively.
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