Evaluation of Different Pheromone Traps for the Monitoring and Timely Application of Insecticide against Fall Armyworm, Spodoptera frugiperda (J.E. Smith) on Maize (Zea mays L.)
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Date
2024
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MPUAT, Udaipur
Abstract
The present investigations on “Evaluation of Different Pheromone Traps for
the Monitoring and Timely Application of Insecticide against Fall Armyworm,
Spodoptera frugiperda (J.E. Smith) on Maize (Zea mays L.)” were conducted at
Agronomy farm, Rajasthan College of Agriculture, MPUAT, Udaipur during Kharif
2022. Before the first application the mean number of plants showing Davis score 3
and 6. The highest mean number of plants showing Davis score 3 was observed in T3-
Emamectin benzoate 5% SG spray at 10% of plants with Davis Scale 3-type damage
and untreated control (3.00). Whereas the highest mean no. of plant showing Davis
scores 6 was observed in T1- Insecticide application: 10 d after the pheromone trap
catches three S. frugiperda adult moths (first trap 1) (3.00). The lowest mean no. of
plant showing Davis scores 3 was observed in T5-Emamectin benzoate 5% SG spray
at 10% of plants with Davis Scale 6-type damage (1.00) and Davis score 6 observed
in T4- Insecticide application at 20% of plants with Davis Scale 3--type damage after
Ten days of first spray(0.33). The highest mean per cent larval mortality of FAW
(45.83%) after 3 days of treatment was found in T1: Emamectin benzoate 5% SG
spray: 10 days after the pheromone trap catches of three S. frugiperda adult moths
(first trap 1) which was significantly different from other treatments. The treatment
T4-Emamectin benzoate 5% SG spray at 20% of plants with Davis Scale 3-type
damage recorded the highest mean per cent larval mortality of FAW (62.04%) after 7
days of treatment. The maximum mean per cent FAW larval mortality of 42.93% after
10 days of treatment was found in T4-Emamectin benzoate 5% SG spray at 20% of
plants with Davis Scale 3--type damage. The lowest mean no. of plant showing Davis
scores 3 and 6 was observed in same treatment T5-Emamectin benzoate 5% SG spray
at 10% of plants with Davis Scale 6-type damage (0.66 and 0.33) after Ten days of
second spray. The highest mean per cent larval mortality after 3, 7 and 10 days of
second spray was found in same treatment T2-. Two spray insecticide applications of
Emamectin benzoate 5% SG: the first one (first trap 1) and the second application after the capture of three S. frugiperda adults, initiating the counting in the trap on the
fifth day after the first insecticide application (50.80%, 60.77% and 44.53%). The
highest grain yield obtained from the treatment T
2
- Two spray insecticide applications
of Emamectin benzoate 5% SG : the first one (first trap 1) and the second application
after the capture of three S. frugiperda adults, initiating the counting in the trap on the
fifth day after the first Emamectin benzoate application(4055.56 Kg/ha).
The moth trap at 1 and 2-meter height (t=1.67, mean 1.50, 7.50) was found
superior over delta and funnel traps. The highest mean FAW male moths capturing
(29.00) during 40th SMW (standard meteorological week) with corresponding weather
parameters i.e., maximum and minimum temperature (0C), morning and evening
relative humidity (%) and rainfall (mm) were 34.3, 18.9, 68.1, 48.1 and 8.2,
respectively. The correlation with adult moth capturing and weather parameters with
the maximum temperature (0.641)* showed a positively significant on male adult
capturing through pheromone traps. Similarly, relative humidity in the morning (r=-
0.783*) and in the evening hours (-0.667*) showed a significant negative correlation
with the mean male moth catches of FAW.
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Hada B.P.S. and Babu S. R.