Application of Botanical Insecticides on The Mortality Rate of Tobacco Cutworm (Spodoptera litura) in Indian Mustard (Brassica juncea L.)

Abstract

This research has done at Sampali Village, Percut Sei Tuan District, North Sumatra, from January to February 2019. The method in this research by using Random Block Design method (RBD), with an extract of plant insecticide, consisting of 8 levels treatment, namely: I0 = without treatment (control), I1 = tuba root extract concentration of 5% (50 ml/L water), I2 = tuba root extract concentration of 10% (50 ml/L water ), I3 = noni fruit extract 5% 50 ml/L water), I4 = noni fruit extract concentration of 10% (50 ml/L water), I5 = celery leaf extract 5% (50 ml/L water ), I6 = celery leaf extract 10% (50 ml/L water); and I7 = insecticide Colombus 600 EC (0.5 ml/L water), with 3 replications. The parameters observed are mortality of armyworm, intensity of crop damage due to armyworm, effectiveness of vegetable insecticide, plant height and crop production per plot. The results who get from this research by insecticides application of plant-based had a very significant effect on the percentage of mortality of armyworm, the intensity of crop damage, the speed of death of armyworm, plant height and production per plot of mustard plants. Application of tuba roots with a concentration of 50 ml/l water (I1) very effective in controlling the attack of armyworm on mustard plants, because with this application the armyworm most quickly dies, ie at the age of 21 day after planting day with 100% mortality percentage, the intensity of damage is only 14.58% so that it, can produce the highest mustard production, the amount of total production is 173.33 kg/plot (1,73 ton/ha).