PERKEMBANGAN PENYAKIT JAMUR EMBUN UPAS (Peronospora clestructor (Berl) Casp. TANAMAN BAWANG MERAH PADA BEBERAPA CARA PEMUPUKAN DAN FUNGISIDA (The development of downy mildew of onion at some fertilizer and fungicide treatments)

Wahab , Rosnelly and D, Nasrun (2010) PERKEMBANGAN PENYAKIT JAMUR EMBUN UPAS (Peronospora clestructor (Berl) Casp. TANAMAN BAWANG MERAH PADA BEBERAPA CARA PEMUPUKAN DAN FUNGISIDA (The development of downy mildew of onion at some fertilizer and fungicide treatments). Jurnal Stigma, 8 (3). pp. 224-228. ISSN 0853-3776

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Abstract

The downy mildew is one of the most important diseases on reduce of anion yield, especially on rainy or wet season. In the integrated pest management, a disease can be controlled through some technical methods such as fertilizer management is one of the most important things and beside fungicide application as the last alternative. The experiment was carried out at Sukarami experimental station of Sukarami Assessement Institute For Agriculture Technology about 950 m abouve sea level on rainy season (November 1999 to January 2000). The treatments were arranged in a split plot design and replicated for three times, In the experiment tesfed four fertilizer treatments (A = 150 kg Urea,450 kg 2A,200 kg SP36, 200 kg KCI per ha; B= A + SS; C = A + NPK; D = A + SS + NPK) as the main plot and fungicide application ( a =Sistemic, b=Contact; c=a and b intermitten, and without fungicide application were as the sub plot. The data collected were downy mildew infection (3-7 week after plantingn tuber number, and yield. The result observations showed that fertilizer C (A (Urea, ZA, SP36, KCI) + NPK (15,15,15) was the most effective to downy rnildew control smong fertilization treatments and with the highest yield, while sistemic and contact fungicide intermitten application also wifh the lowest infection of downy mildew and gave the highest yield among fungicide application treatments.

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