TROPICAL PLANTS COMMONLY AFFLICTED BY ALTERNARIA AND ITS RELATIVES Alternaria Bipolaris
MANAGEMENT RECOMMENDATION
Corynespora Drechslera Exserohilum Helminthosporium Stemphylium
African Violet Aloe Aralia Bromeliads Cacti Calathea Cordyline Desert Rose Ficus Grasses Kalanchoe Lipstick Vine Mandevilla Palms Schefflera Zebra Plant
+ E liminate overhead irrigation. Insecticidal soaps and oxamyl (IRAC 1A) both provide control of Alternaria leaf spot equivalent to the fungicides. Acephate (IRAC 1B) can also reduce disease severity. Adequate plant nutrition including micronutrients are very important and can reduce the severity of disease. Some of the minor element sprays mimic leaf spot symptoms caused by Helminthosporium (Bipolaris, Exserohilum) on palms.
+ U sing infected plugs or cuttings
FUNGICIDES FOR CONTROLLING ALTERNARIA AND RELATED FUNGAL LEAF SPOTS Tradename FRAC Group
Chlorothalonil
Daconil Ultrex®, Daconil Weatherstik®
M5
Iprodione
Chipco® 26019 Flo, Chipco® 26019 WP
2
DMI
Avelyo®, Eagle®, Terraguard®
3
DMI + SDHI
Postiva TM
3 + 7
Reach out to your Harrell’s rep for more information.
Compass®, Heritage®, Empress® Intrinsic®, Fame®
Strobilurin
11
Strobilurin + SDHI
Broadform®, Orkestra® Intrinsic®, Mural®
7+11
Fludioxonil
Medallion®, Emblem TM
12
Follow the product label and rotate between FRAC groups to reduce resistanace development * Fungicides containing thiophanate methyl can increase the severity of Alternaria leaf spot ** Broad spectrum products including copper and mancozeb are somewhat effective
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