Resistance Assessment of Citrus Varieties against Gummosis Disease caused by Phytophthora nicotianae under Natural Field Conditions
Resistance Assessment of Citrus Varieties against Gummosis Disease caused by Phytophthora nicotianae under Natural Field Conditions
Hamza Tariq1, Nasir Ahmed Rajput1*, Muhammad Atiq1, Shahbaz Talib Sahi1, Abdul Rehman1, Abdul Rashid1, Muhammad Ahsan Khan2, Akhtar Hameed1,3 and Warda Modassar Saddique1
ABSTRACT
Citrus gummosis caused by Phytophthora nicotianae is the most damaging disease of citrus. In the present study, twelve varieties of citrus were screened against gummosis under natural field conditions under Randomized Complete Block Design (RCBD). Among these varieties, Kumquat expressed a highly resistant response with lesion size (0.750 cm), Sweet Lemon exhibited resistant response with (1.616 cm) lesion size, Mangal Singh moderately resistant with rating (3) while two varieties i.e. Malta and Succari exhibited moderately susceptible response, three varieties i.e. Jaffa, Tangerine and China Lemon (4.066, 4.250, 5.100 cm) lesion size respectively showed susceptible response while four varieties (Tracco, Rough Lemon, Kinnow, Grapefruit) exhibited highly susceptible response with the rating (7). Kumquat shows a resistance response in a present study and Grapefruit shows highly susceptible results during the experiment.
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