Growers should be keeping a watch for spruce spider mite with the hot, dry weather we have been having recently. Growers should be scouting to determine the presence of mites and they should review the economic thresholds to determine if or when they would need to treat.
The economic thresholds used by most growers are listed below. However, each grower has different needs for tree quality. These numbers should be adjusted up or down by each grower based on his or her own experience and needs.
Size of Tree
Less than waist high 40%
Waist high to year before sale 20%
Year of sale 10%
*Percentage of infested shoots to sampled shoots
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