Method for cultivating tobacco plants for breed conservation and expanding of aphidius gifuensis ashamaed

The invention discloses a method for cultivating tobacco plants for breed conservation and expanding of aphidius gifuensis ashamaed. According to the method, a greenhouse is used for cultivating the tobacco plants for breed conservation and expanding of aphidius gifuensis ashamaed, a small shed is constructed when the temperature is low in February, and the set temperature is 3-7 DEG C higher thanthe temperature of the greenhouse, so that the growth of tobacco plant branches is rapid, and requirements of myzus persicae expanding for the tobacco plants can be achieved within 20-30 days, so that a time node for subsequent cultivation of aphidius gifuensis ashamaed is ensured; in addition, according to the method, since the tobacco plants are cultivated in soil which has environment humiditymuch lower than the humidity of a nutrient pool in an existing floating-tray plant expanding technology, no entomophthora aphidis emerges, and therefore the problems of high occurrence of entomophthora aphidis and high manage