Steps required for controlled Cross pollination:
- Selection of the parents having desirable characters.
- Emasculation i.e. Removal of the stamens from one of the parents (if bisexual). This is done to prevent self-pollination.
- Bagging: The emasculated flowers are immediately covered by polythene bags or paper bags to prevent cross pollination by unwanted pollen grains.
- When the stigma of the bagged flower attains receptivity, mature pollen grains collected from the other male parent are dusted on the stigma.
- After crossing, the flowers are bagged again and the fruits are allowed to develop.
- Tagging and labeling: The crossed flowers are tagged and labelled.
Emasculation is not always required in a cucurbit plant, since the female parent usually produces unisexual flowers. However, sometimes it may have bisexual flowers in which case emasculation is needed.