A wettable powder bioherbicide containing fungal spores of Colletotrichum gloeosporoides causes stem and leaf blight in Northern Jointvetch.

Correct option is A

Collego is a bioherbicide that contains fungal spores of Colletotrichum gloeosporoides, which causes stem and leaf blight in Northern Jointvetch, a common weed.
Explanation:
· (a) Collego – Correct answer. Collego is the wettable powder bioherbicide containing Colletotrichum gloeosporoides spores, used to control Northern Jointvetch.
· (b) Colex – This is not a known bioherbicide containing Colletotrichum gloeosporoides.
· (c) Biolophos – This is a different type of bioherbicide and not related to Colletotrichum gloeosporoides.
· (d) Bioholps – This is also not the correct bioherbicide for controlling Northern Jointvetch.