Select the best. Positive selection to improve farm saved seed potatoes. Trainers manual

摘要

This training manual is designed to provide step-by step instructions to trainers in teaching potato farmers positive selection, that is, to ‘select the best’. Positive selection can be used to improve the quality of the seed potatoes saved from the farmers own crop. It is assumed that the trainer himself or herself has gone through some practical training on positive seed selection of 2-3 days before using this manual. The trainer should be able to recognize virus symptoms, bacterial wilt and late blight in the field. Further, it is assumed that the trainer knows how to grow potatoes....