The Study of Biology and Predation Efficiency of Ring-legged Earwig (Euborellia annulipes (Lucas)) on Mustard Aphid (Lipaphis erysimi (Kaltenbach))
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Abstract
The study on predation efficiency of ring-legged earwig (Euborellia annulipes (Lucas)) on Mustard aphid controls was conducted at the laboratory of Biological Control Section, Entomology and Zoology Research Group, Plant Protection Research and Development, Bangkok, Thailand. The study aimed to determine the efficiency and potential utilization of ring-legged earwig (E. annulipes ) to control Mustard aphid. (L. erysimi). This study was comprised two experiments. The first experiment explored the lifespan of E. annulipes through feeding on cat food. Female E. annulipes laid eggs in clusters, which were white and oval-shaped. The results displayed the average duration of each development stage : egg stage, nymph stage (1-5), and male and female stages which were : 9.35±1.37, 42.40±1.89, 86.54±9.61, and 103.71±11.21 days, respectively. Females laid eggs 6-9 times throughout their lifespan, with an average of approximately 51.10±6.41 eggs per cluster each time. The second experiment involved feeding 30 of each small aphid (1-3 instar larvae) and large aphid (4 instar larvae and adults) to each stage of E. annulipes every day (at 2nd, 3rd, 4th, 5th stage, and adult (males and females). The present study showed that at the 2nd, 3rd, 4th, 5th stage, and adult stages (males and females) of E. annulipes were able to consume small Mustard aphids (L. erysimi) at an average of 16.67±10.55, 34.38±14.85, 48.90±15.04, 51.13±11.90, 52.07±18.78, and 56.42±22.84 aphids per day, respectively. The consumption rate of E. annulipes on large Mustard aphids (L. erysimi) was approximately 3.13±1.63, 4.91±3.02, 9.54±5.48, 10.75±8.13, 11.12±5.13, and 12.58±5.45 aphids per day, respectively. The feeding efficiency of E. annulipes from this study will be used as insightful information for farmers to further utilize the ring-legged earwig as a biological control for the infestation of aphids.
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