Studies on diseases and disorders of different citrus germplasm under natural condition
Adesh Kumar and Tanjeet Singh Chahal
Citrus research block of Punjab Agricultural University, Fruit Research Station Jallowal-Lesriwal was surveyed during 2016 and incidence of disease and disorder was recorded. Ten cultivars of sweet orange, 3 mandarin, 3 lime, 3 lemon, 5 grapefruit and 1 kumquat (Fortunella) cultivars screened naturally with respected to citrus gummosis, fruit cracking, canker, nutrient deficiency and fruit dropping. Highest fruit cracking mean was observed in sweet orange and mandarin with 4%. However highest citrus cankers incidence was observed in lime and grapefruit with 81.66% and 78% respectively. It was also observed that Kumquat (Fortunella) showed an immune type of response to canker disease. Fruit dropping was observed greatest in mandarin (23.35%), it was not observed in lime, lemon and Kumquat (Fortunella). Nutrients deficiency was more common in sweet orange. However no citrus gummosis symptom was observed in any cultivars of citrus germplasm.