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Stage Description Control-Pollination Step
1 Buds containing female small with tight bud scales
2 Buds enlarging with spreading scales but strobilus completely enclosed Install isolation bags
3 Strobilus emerging through tip of bud scales Late for bagging, conelets must be bagged before Stage 3
4 Strobilus extending at least 1/3 to ½ beyond bud scales Early for optimum pollination results
5 Strobilus extending fully from bud scales and the space between bracts and bud scales open Apply pollen for optimum results
6 Space between bracts and cone scales closed Late for pollination, remove isolation bags

Table 1. Developmental stages of female strobili and appropriate control-pollination steps.