Amna Riasat, Muhammad U. Ghazanfar, Waqas Raza


Present investigations deal with the co-relation of inoculation methods and citrus leafminer (Phyllocnistis citrella Stainton) development stages with Citrus canker disease incidence on citrus seedlings. Bacterial pathogen was applied at three different concentrations i.e. 1×102, 1×104 and 1×106cfu ml-1 and effect was monitored after 4, 8, 12, 16- and 20-days post treatment. Seven discrete treatments were compared: intact leaves, mechanically wounded leaves, CLM injured leaves (egg, first instar larvae, second instar larvae, third instar larvae and pupal stage). Results revealed that injuries caused by 3rd instar larvae (TIL) and pupal stage (PS) lead to maximum disease incidence .The maximum disease incidence in case of TIL was 50.61, 68.51, 81.47, 93.20, and 100 % whereas, for PS it was 43.82, 59.25, 71.60, 84.56 and 100 % after 4, 8, 12, 16 and 20 days at the highest dose rate. It was concluded that for establishing an effective plant protection program attention should be necessarily given to the ecology of pest species considering the emerging threats of the insect pests and pathogens to horticultural and other food crops of the country.


Citrus, Leafminer, Citrus Canker, Damage, Management

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