Biological Life Tables of Spodoptera frugiperda Fed on Three Host Plants, Spatial Distribution Pattern and Age Structure Change of Larval Stages in Baby Corn Field
ตารางชีวิตแบบ Biological Life Tables และประชากรของหนอนกระทู้ข้าวโพดลายจุด Spodoptera frugiperda (J.E. Smith) (Lepidoptera : Noctuidae )
Keywords:
Biological life tables, Distribution patterns, Spodoptera frugiperdaAbstract
Spodoptera frugiperda (JE Smith) is a key pest of corn. There are more than 80 kinds of host plant of S. frugiperda such as rice, sugarcane, sorghum, legumes, tomatoes, potatoes, tobacco, cotton, sunflower, garlic, ginger etc. It can cause severe damage to host plants. The study of the life tables in the laboratory of S. frugiperda were conducted in three kinds of plants: sweetcorn, sugarcane cv. Khon Kaen 3, and rice cv. Suphanburi 60, which are the main food plants and are the main economic plants of Thailand. Eggs laid on the same day, 900 eggs were used. A larva was placed in a box containing food plant. Each food plant was fed to 300 larvae of S. frugiperda for 300 larvae. Artificial diet was change periodically count and recorded the number of deaths 4 days until becoming adults. Then count the eggs of adults. Until the adults die. The results showed that larvae fed with sweetcorn, sugarcane cv. Khon Kaen 3 and rice cv. Suphanburi 60 had the net reproductive rates (Ro) were 401.12, 62.47, and 25.5. The cohort generation times (Tc) were 34.54, 32.18, and 38.35 days. The capacity for increase (rc) were 0.173, 0.1284 and 0.0844. The finite rate of increase (λ) was 4.007, 5.3972 and 8.2120 times. The results of the study showed that S. frugiperda has the highest net reproductive rate in sweetcorn. This suggests that this insect has the potential to spread and thrive as a pest in corn. Distribution patterns of S. frugiperda in 10, 17, 24, 31, 38, 45, 52 and 60 days after field planting of baby corn were aggregrated, aggregated, aggregated, regular, regular, regular, regular and regular, respectively
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