Yield-Loss Relationships and Economic Injury Levels for European Corn Borer (Lepidoptera: Pyralidae) Populations Infesting Pennsylvania Field Corn

Efficacy of Bt maize against European corn borer in Central Europe

“…According to their data, the average grain weight reduction over years was 6% and 5% per larva when the stalk feeding was initiated during the 10-leaf and 16-leaf stages of the plant development. The experimental data by Bode and Calvin (1990) correspond very well with those from our regression model of the damage curve.…”

“…According to our model, one ECB larva that finished the development in maize causes a decrease of yield by 7.9%. Bode and Calvin (1990) determined the yield loss relationship and economic injury level of ECB population infesting field maize. According to their data, the average grain weight reduction over years was 6% and 5% per larva when the stalk feeding was initiated during the 10-leaf and 16-leaf stages of the plant development.…”

“…The yield-losses relations and economic injury level for ECB were established in the field studies by Bode and Calvin (1990) in accordance with the definition of the economic injury level published by Pedigo et al (1986). The efficacy and risk efficiency of sweet corn hybrids expressing a Bacillus thuringiensis toxin for Lepidoptera pest management were established by Burkness et al (2002).…”

Penetuan Ale Dan Ae Larva Lepidiota Stigma F Pada Tanaman Tebu

“…Jadi nilai proporsi kehilangan hasil permeter 2 yang telah dimodifikasi berdasarkan model Walker adalah PL = {(Yp-Yf) x Cf}/Yp dengan Cf = (Pr x Pi)/Pt, di mana Yp = potensi hasil panen maksimum (kg/m 2 ); Yf = hasil panen di lapang (kg/m 2 ); Cf = faktor koreksi; Pr = proporsi akar hilang per larva per tanaman; Pi = jumlah populasi hama di lapang permeter 2 , dan Pt = jumlah populasi tanaman permeter 2 . Nilai ALE per satuan luas m 2 dihitung berdasarkan model yang dikembangkan oleh Bode & Calvin (1990) dengan rumus ALE = TC/(CV x PL x PC) atau ALE = TC /{(MV x EY) x PL x PC, dimana TC = total biaya untuk sekali pengendalian termasuk upah tenaga kerjanya (Rp/ha), PL = proporsi kehilangan hasil permeter 2 , CV = nilai tanaman (Rp/ ha), MV = harga hasil tanaman di pasaran (Rp/kg), EY = potensi hasil maksimum tanaman (kg/ha), dan PC = proporsi penurunan populasi hama karena tindakan pengendalian. Pada penelitian ini ditentukan nilai AE sebesar 80% dari nilai ALE.…”

“…Nilai ALE per satuan luas meter 2 dihitung berdasarkan model ALE yang dikembangkan oleh Bode & Calvin (1990) yaitu ALE = TC/(CV x PL x PC) atau ALE = TC/{(MV x EY) x PL x PC, dimana TC = total biaya untuk sekali pengendalian termasuk upah tenaga kerjanya (Rp/ha), PL = proporsi kehilangan hasil per m 2 , CV = nilai tanaman (Rp/ha), MV = harga hasil tanaman di pasaran (Rp/kg), EY = potensi hasil panen tanaman maksimum (kg/ha), dan PC = proporsi penurunan populasi hama karena tindakan pengendalian.…”