Published in Scientific Papers. Series B, Horticulture, Vol. LXV, Issue 1
Written by Daniel JALOBĂ, Gheorghe PETRE, Stelica CRISTEA
The aim of this study is to provide information on genetically diseases-resistant varieties of apple inbred at Voinești station and their behaviour under reduced number of phytosanitary treatments. The evolution of two harmful pathogens attack (apple scab and powdery mildew) on two common varieties, nine Romanian varieties and three foreign varieties was monitored in untreated control samples, samples treated following specific scheme and samples with no specific fungicides. The degree of attack and the effectiveness of the treatments were calculated. Assessments have shown that the classic varieties Ionathan and Golden Delicious had a high sensitivity to diseases in the climatic conditions of 2020. Romanian apple varieties proved total resistance to scab (100%) and very low susceptibility to powdery mildew (0.26- 4.54%) so that a limited number of fungicidal treatments are needed. Their yields were at high level of quality and quantity, ranging from 24 to 36.7 tons/ha. The result of the growing of genetically diseases-resistant varieties is that pollution is mitigated and increased fruit production is achieved.
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