Powdery Mildew

Powdery mildew of mango, caused by the fungus Oidium mangiferae,  fungicide for plants infects flowers, leaves and fruits. Infected parts are covered with a whitish powdery growth before they become brown and dry. Small fruits abort and fall off while older fruits develop lesions and corky tissue. This fungal pathogen spreads from other trees or within one tree's canopy by wind. Several fungicdes can control powdery mildew, including products with active ingredients like neem oil, carbonic acid and monopotassium salt, hydrodesulfurized kerosene, sulfur, myclobutanil and aliphatic petroleum solvent. For effective control, the first application should occur by the time trees reach 50 percent of full flowering and subsequent sprays should be applied every seven to 14 days until fruit set.

Anthracnose

Anthracnose, caused by the fungus Colletotrichum gleosporoides, forces the development of leaf spots, flower blight and fruit rot, which can greatly reduce a tree's yield. Ripe fruit develops brown decay spots or streaks. Different cultivars offer different levels of susceptibility and control of anthracnose on highly vulnerable trees requires a good spray program. Fungicides for anthracnose control that can be applied regularly from the time of flowering to harvest include products that contain copper hydroxide, copper sulfate and mancozeb, among others.