Effect of sprayer boom movement on spray deposition and biological efficacy

摘要

During the growing season of a potato crop late blight must be controlled with approximately 15 sprays. For each spraying, sprayer boom movement was measured for a sprayer passing along the same track over a field. We show how sprayer boom movements change during the growing season as tracks change due to repeated passage over them. Spray deposition was measured over a 10 m length (on collectors spaced at 50 cm intervals) to evaluate variations in spray deposition due to sprayer boom movement. Potatoleaves were picked from this 10 m length also at 50 cm intervals to evaluate the correlations between spray deposition pattern and protection against late blight. Results show a clear relationship between changing sprayer boom movement patterns, spray deposition and biological efficacy.