Effect of Refugia Plant Combination with Biopesticide Application on Population and Attack Intensity of Spedoptera exigua (Hubner) (Lepidoptera; Noctuidae)

Abstract

Abstract Spodoptera exigua is an insect that is an essential pest in shallot plants. Spedoptera exigua is generally controlled with chemical insecticides, which can impact the environment and natural enemy populations. Using a combination of flowering plants and applying plant extracts is one of the environmentally friendly alternatives to reduce population and damage. This study was conducted in Enrekang Regency in South Sulawesi using an RCBD with five treatments and three replications. The treatments are flower, plant extract, flower and plant extract, farmer’s method, and control. Flowering plants were planted at the edge of the bed. Observations were made visually and using a sweepnet. The application of plant extracts and observations were made seven times weekly. Observations were made on the parameters of egg groups, larval populations, attack intensity, and natural enemy populations. The results showed that the treatment refugia plant and plant extract reduced the egg population by 76.64% and the larval population by 92.59%. It increased the population of natural enemies by 72.26%. The farmer treatment reduced the intensity of the attack by 65.03%, which was not significantly different from the flower treatment with plant extracts, with a percentage reduction of 59.38%.

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