Crop Loss Assessment Trials

The most accurate measurements of horizontal resistance are made with field trials designed to measure the pre-harvest crop loss from parasites (Chiarappa, 1971). However, these trials can be cumbersome and labour-intensive. They require large plots and these must be separated by an appropriate space planted to an epidemiologically neutral crop, in order to eliminate both positive and negative parasite interference. Various trial treatments involve the use of different crop protection chemicals to determine the damage being caused by the main categories of parasite (e.g., insects, fungi, bacteria). These trials are both complex and difficult, and they are not recommended for plant breeding clubs.

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