When partly developed flowers are emasculated the stigmas are not ready for the pollen in less than three days, as a rule, even when the weather is clear and warm. If cloudy and cool they may not be ready in less than five or six days. The usual mistake is applying pollen too soon. When ready the stigmas exude a sticky nectar that holds the pollen when applied. With the dry pollen gathered in advance a small camel's-hair brush, slightly moistened, gives the best results in covering the stigma with pollen dust. At once, after pollination, the bag is replaced and the label is attached, giving date and record of the pollen used. This will indicate the flowers not receptive to which pollen is to be applied the next day. In all work keep a brush for each bottle of pollen used.
In from six to ten days the sacks can be taken off, as the ovaries will then indicate success or failure. Those with enlarged ovaries are covered with mosquito bar, which may remain until the fruit is perfectly developed as a protection from birds and insects and to distinguish the pollinated fruits.