INTENSITAS SERANGAN Spodoptera frugiperda PADA BEBERAPA FASE PERTUMBUHAN TANAMAN JAGUNG

Abstract

This study was conducted to determine the attack intensity of S. frugiperda at several stages of corn plant growth. The research was carried out at the Experimental Garden of the Faculty of Agriculture, Jambi University. The research was doneat a 5002 m area of corn plantation which consists of 28 plots with a size of 3 x 2 m for each plot. The variables observed were the intensity of attack of S. frugiperda larvae on the leaves and the percentage of cobs attacked. Observation of attack intensity of S. frugiperda was carried out at all growth phases (phases V3 - V5 to R6 phase), namely by directly observing the symptoms of attack caused by the 3 youngest leaves that were fully opened on each sample plant. Observations of attacked cobs were carried out on all plants in each sample plot starting from the VT - R1 phase to the R6 phase. The results showed that the intensity of the attack of S. frugiperda larvae that attacked the leaves at several stages of corn plant growth fluctuated. The highest attack intensity occurred in the R6 phase, which was 22.92%. Meanwhile, the attack on the cob was first found in the R2 - R5 phase, which was 10% and then experienced a significant increase to 68.57% in the R6 phase.Keywords: attack intensity, maize, S. frugiperda

Natural enemies of Spodoptera frugiperda J.E Smith (Lepidoptera: Noctuidae) on corn plants in West Sumatera

“…The intensity of the S. frugiperda attack is generally related to its population level. Based on the report [15], the higher the population level of S. frugiperda, the higher the percentage of plants attacked and the intensity of the attack on the leaves. Some of the symptoms of damage caused by larvae look like the leaves appear transparent, the presence of sawdust, and the leaves become perforated.…”

“…The different levels of attack on corn plants are due to the age of the plants and the variety of plants planted. Some of the damage caused by FAW attack includes the loss of the leaf epidermis layer, which causes the leaves to appear transparent [15]. The second and third instar larvae cause damage by making holes and eating the upper leaves [2; 13].…”

“…IOP Publishing doi:10.1088/1755-1315/1160/1/012045 2 In the generative period, FAW could consume corn cobs up to the R6 phase or physiologically ripe conditions, and even the attack was highest just before harvest by 68% so that it could significantly reduce crop yields [15]. The amount of yield loss caused by FAW attacks has been reported in the province of East Nusa Tenggara, which reached 24 thousand tons of corn plants or equivalent to 120 billion [16].…”