Surveys of spraying practices for banana leaf disease control in New South Wales, and an assessment of disease control based on leaf retention at harvest in July
1992
Allen, R.N. (New South Wales Agriculture, Wollongbar (Australia). Wollongbar Agricultural Inst.) | Akehurst, A.A. (New South Wales Agriculture, Macksville (Australia). Advisory Office) | Ireland, G. (New South Wales Agriculture, Coffs Harbour (Australia). Advisory Office)
Commercial banana plantations were surveyed over 2 years to determine spraying practices and their efficacy in retaining leaves. A climatic index (CIP) based on temperature and wetness was applied. In one year, a spray frequency model indicated that leaves per plant at harvest (LR) increased with number of sprays applied and decreased with damage from wind and frost. Another model based on CIP indicated that LR decreased with increasing accumulated CIP, and with wind and frost damage. Applied to the data from the second year, the spray frequency model fitted poorly and was biased; the CIP model was without bias and fitted well. LR was also related negatively with damage by burrowing nematode and by banana weevil borer, with increasing latitude, and with decreasing electrical conductivity of the soil solution.
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