Question

Light blight of potato due to
a)Alternaria solani
b)Albugo candida
c)Fusarium Moniliforme
d)Phytophthora infestans

Answer 1

Hint:It is a symptom of late blight on the underside of a potato leaf. A microorganism that causes serious potato disease known as late blight of potato blight. Early blights, caused by Alternaria one is also often called light blight of potato.

Complete answer:
Light blight of potato is caused by the fungal pathogen Alternaria Solani. The disease affects leaves, stems and tubers and can reduce yield. Tuber size store ability of tubers quality of fresh market. The pathogen produces distinctive “bullseye” the pathogen produces distinctive “bullseye” patterned leaf spots and can also cause stem lesions and tuber blight on potatoes. A devastating disease of potatoes produced by phytophthora infections.
Early or light blight can cause significant yield reductions. Solani is also present in most potato production regions every year but has a significant effect on yield only when frequent wetting of foliage favours symptoms development. It is a deuteron site with a polycyclic life cycle. It reproduces asexually through conidia. It kills the host using cell wall degrading enzymes and toxins and feeds on the dead plant cell material In the spring, conidia are produced. Multicellular conidia are splashed by water or by wind onto an uninfected plant, infecting the plant by entering through small wound stomata or direct penetration. Infections usually start on older leaves close to the ground. The fungus takes time to grow and eventually form as lesion from this lesion, more conidia infect other parts of the same plant within the same growing season.

Hence option ‘d’ is the correct answer..

Note: It also causes tuber, infection.
>It is a common foliage disease of potatoes.
>Infection can occur from early to mid-July when frequent rains occur.
>Temperatures remain near 75-80 F.