EVALUATION OF MATING DISRUPTION PASTE (MDP) TECHNOLOGY AND SEX PHEROMONE TRAP FOR COTTON PINK BOLLWORM 3769
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Date
2023-09
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JAU JUNAGADH
Abstract
The present investigations were framed to evaluate different doses and release
rates of Gir Sawaj Mating Disruption Paste (MDP) and the installation of sex
pheromone traps at different trap densities and heights for the management of pink
bollworm in cotton. The field studies were carried out on farmers' fields at Khadiya,
Nani-Parabdi, and Kathrota villages of Junagadh district during the year, 2021-22 and
2022-23.
The results showed that the use of Gir Sawaj MDP @ 500 g/ha and 400 g/ha
resulted in the lowest percentage of rosette flowers (2.40-3.20% and 2.60-3.40%),
green boll damage (3.10-3.30% and 3.35-3.55%), open boll damage (4.00-4.40% and
4.30-4.65%) and locule damage (4.28-4.65% and 4.65-4.95%), respectively. These
doses were also found to be equally effective in reducing moth catches with the lowest
(2.07 and 2.66 moths/trap/week) moths catches observed in Gir Sawaj MDP @ 500
and 400 g/ha, respectively. The study suggested that the use of Gir Sawaj MDP @ 500
g/ha and 400 g/ha could be an effective strategy to manage pink bollworm infestation
in cotton.
The concentration of pheromone in Gir Sawaj MDP decreases gradually over
time and the paste needs to be re-applied after a certain duration to ensure the
reduction of pests. The decay curve analysis revealed that the reduction in pheromone
content was 16.09%, 24.89%, 53.85% and 70.14% after 10, 20, 30 and 40 days,
respectively. The study also revealed that the residual pheromone in Gir Sawaj MDP
decreased from 100% on the day of application to 29.86% after 40 days. However, the
release of pheromone persisted until the residues were depleted, with stronger
adhesive forces leading to a slower release of pheromone over time. The release rate
of pheromone in Gir Sawaj MDP for cotton pink bollworms is gradual, and the paste
needs to be re-applied periodically to maintain its effectiveness.
The recommended dose of Gir Sawaj MDP @ 400 g/ha was evaluated with the
farmers' practices. The results of both years showed that the lowest percentage of
rosette flowers (2.34% and 1.57%), green boll damage (3.18% and 2.55%), open boll
damage (3.68% and 3.08%) and locule damage (3.98% and 3.55%) was recorded in
the Gir Sawaj MDP @ 400 g/ha as compared to farmers’ practices. The treatment also
led to a reduction of moth catches (4.10 and 2.60 moths/traps/week) and an increase in
cotton yield (3267 kg/ha). Moreover, Gir Sawaj MDP @ 400 g/ha showed economic
feasibility with high net realization (₹109510/ha) and high ICBR of 1:13.52 as
compared to farmers' practices. Therefore, Gir Sawaj MDP was found to be superior to
farmers' practices for the effective management of pink bollworms in cotton.
The sex pheromone traps installed @ 60 and 50 traps/ha recorded the lowest
percentage of rosette flowers (3.20-4.70% and 3.60-5.20%), green boll damage (4.90-
5.20% and 5.30-5.60%), open boll damage (5.90-6.40% and 6.30-6.90%), locule
damage (6.60-7.70% and 7.10-8.40%), moth catches (43.52 and 38.20
moths/trap/week) and the highest cotton yield (3029 and 2917 kg/ha), respectively.
The study concluded that a trap density of 50 pheromone traps per hectare is optimal
for managing pink bollworm infestation in cotton. The population of pink bollworms
was correlated with weather parameters and the results discovered a significant
positive correlation between moth catches and maximum temperature and bright
sunshine hours while it showed a significant negative correlation with morning and
evening relative humidity and wind speed.
It appears that sex pheromone traps installed at the crop canopy level were the
most effective height of traps for capturing moths of cotton pink bollworm as they
recorded the highest (28.13 moths/trap/week) number of moth catches. However, it
was followed by traps installed above and below 15 cm in height, which recorded
17.98 and 16.99 moths/trap/week, respectively. The results showed that the installation
of sex pheromone traps at the crop canopy level was found to be effective for the
management of pink bollworms.
From the overall results of the present investigations, it is recommended to
give three applications of Gir Sawaj MDP @ 500 g/ha or 400 g/ha at 40 days of
interval as the pheromone exhibited slow release rate from the paste upto 40 days or
install sex pheromone traps @ 60 or 50 traps/ha at crop canopy level for the effective
management of pink bollworm in cotton.