Critical Values
None established.
• Sampling Procedures
Sample the most recently mature leaves prior to root or bulb enlargement. Avoid dusty
or soil-covered leaves and plants whenever possible. Under normal conditions, rainfall is
frequent enough to keep leaf surfaces fairly free of dust and soil particles. However, when
leaves are dusty, brush or wipe with a damp cloth to remove the contaminants. If this is not
effective or if leaves are covered with spray materials, wash in a mild detergent solution
(0.30%) and rinse in running water. Do not prolong the washing procedures.