Bull. Spec. CORESTA Congress, Vienna, 1984, p. 112, P08, ISSN.0525-6240

Leaf picking before harvesting _ a measure to decrease eye-spot disease in Vorstenlanden tobacco

SISMADI
PN Perkebunan XIX Jln. Brigjen Slamet Ryiadi 272 Sala, Indonesia
Eye-Spot Disease is caused by Cercospora nicotianae El & EV. With Vorstenlanden tobacco this is a serious disease. Where leaves are harvested during the rainy season, the climate is favorable for fungus infection. Sand leaves are the first to be infected with the fungus at the local necrotic spot. With high humidity the upper leaves may also be attacked. The intensity of the disease could be decreased by leaf picking before harvesting or the spraying of a fungicide. Through the picking of 6 to 8 leaves before harvesting the incidence of eye-spot could be decreased 15- to 16 percent; the spraying of 1.8 kg in solution of Mancosep per ha decreased leaf eye-spot by 9.6%. The influence of the time of leaf picking on the intensity of the eye-spot disease was also determined.