<P> The thick - walled oospores are the main overwintering structures , but the mycelium can also survive in conditions where all the plant material is not destroyed during the winter . In the spring the oospores germinate and produce sporangia ( s . sporangium ) on short stalks called sporangiophores that become so tightly packed within the leaf that they rupture the epidermis and are consequently spread by the wind . The liberated sporangia in turn can either germinate directly with a germ tube or begin to produce biflagellate motile zoospores . These zoospores then swim in a film of water to a suitable site and each one produces a germ tube - like that of the sporangium - that penetrates the stoma . When the oomycete has successfully invaded the host plant , it grows and continues to reproduce . </P>
<P> The thick - walled oospores are the main overwintering structures , but the mycelium can also survive in conditions where all the plant material is not destroyed during the winter . In the spring the oospores germinate and produce sporangia ( s . sporangium ) on short stalks called sporangiophores that become so tightly packed within the leaf that they rupture the epidermis and are consequently spread by the wind . The liberated sporangia in turn can either germinate directly with a germ tube or begin to produce biflagellate motile zoospores . These zoospores then swim in a film of water to a suitable site and each one produces a germ tube - like that of the sporangium - that penetrates the stoma . When the oomycete has successfully invaded the host plant , it grows and continues to reproduce . </P>
albugo reproduces asexually by means of structure which are called
albugo reproduces asexually by means of structure which are called
sporangiophores
sporangiophores