Plantwise Factsheets for Farmers
Leaf Spot on Groundnut
Mycosphaerella berkeleyi, Mycosphaerella arachidis
Recognize the problem
difference between early and late leaf spot are that early leaf spot causes brownish
grey lesions on the lower leaf surface, and late leaf spot causes black spots
on the upper leaf. Early leaf spots are irregular and late leaf spots are small
disease occurs 3-5 weeks after sowing. Early leaf spot occurs first and late
leaf spot develops second. It is a soil borne disease and spreads by rain,
water and wind from infected groundnut debris.
spot can reduce photosynthesis rate and weaken the plant.
a resistant variety such as Sinpadetha 6 or Sinpadetha 7
the alternative hosts
and bury the infected plant debris
a fungicide such as chlorothalonil (e.g. Daconil), benomyl (e.g. Funomyl 50WP) or thiophanate-methyl (e.g. Topsin M)
When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval.
The recommendations in this factsheet are relevant to:
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