Aster Diseases
Gary W. Moorman, Professor of Plant Pathology
| Disease | Symptoms | Pathogen/Cause | Management |
|---|---|---|---|
| ASTER YELLOWS | Leaves yellow. Abnormal branching occurs. Yellowed, leaf-like tissue forms instead of flower parts. | Phytoplasma | Destroy infected plants. Maintain good leafhopper control. Destroy any similarly affected weeds in the vicinity. |
| BOTRYTIS BLIGHT | Brown specks form on petals. The entire flower browns and dies. | Botrytis cinerea | Avoid sprinkler irrigation. Apply mancozeb, maneb, manganese + zinc, fludiononil, iprodione, copper sulfate, copper hydroxide, or chlorothalonil. |
| FUSARIUM WILT | Young seedlings are killed. Older plants are stunted and have yellowing and wilting up one side of the plant. Water conducting tissue in the stems browns. | Fusarium oxysporum | Use potting soil that has been treated to eliminate pathogens. Or, use soilless potting mix. |
| LEAF SPOTS | Spots form on leaves. Leaves Yellow, wilt, and die. Usually lower leaves are affected first and symptoms progress upward. | Alternaria, Ascochyta, Cercospora, Septoria | Avoid sprinkler irrigation. Apply mancozeb, iprodione, myclobutanil, fludioxonil, copper sulfate, copper hydroxide, thiophanate methyl + chlorthalonil, or chlorothalonil. |
| POWDERY MILDEW | White felty growth develops on the surface of leaves. Leaves wither and die. | Golovinomyces cichoracearum (formerly Erysiphe) | Apply fludioxonil mineral oil, aliphatic petroleum solvent, sulfur, kresoxim-methyl, myclobutanil, paraffin oil, mancozeb, triforine, triadimefon, thiophanate methyl + mancozeb, or sulfur. |
| RUST | Reddish-orange masses of spores form on the underside of leaves. Severely affected leaves yellow and die. On the alternate host, pines, blisters of spores form on needles in the spring. | Coleosporium solidaginis | No control is recommended. |
Active Ingredients and Trade Names of the Chemicals
| FRAC Group No. | Risk Level | Class | Active ingredient | REI Restricted Entry Interval | Trade names (EPA Reg. no.) |
|---|---|---|---|---|---|
| 2 | 3 | Dicarboximide | iprodione | 12 | Chipco 26GT (100-1138), Chipco 26019 |
| (264-481), Iprodione (51036-361), | |||||
| Sextant (51036-361-59807) | |||||
| 3 | 2 | Piperazole | triforine | 12 | Triforine (241-355) |
| Triazole | triadimefon | 12 | Strike (3125-436), Bayleton (432-1360) | ||
| myclobutanil | 24 | Systhane (707-253) | |||
| 11 | 3 | Strobilurin | azoxystrobin | 4 | Heritage (10182-408) |
| 12 | Echo (60063-7), PathGuard (60063-7-499) | ||||
| Concorde (72167-24-1812), Pegasus (72167-24-1812) | |||||
| Dithiocarbamate | mancozeb | 24 | Dithane (707-180), FORE (707-87) | ||
| Pentathlon (1818-251) | |||||
| manganese + zinc | 24 | Protect T/O (1001-65) | |||
| ziram | 48 | Ziram (4581-140) | |||
| NC | 1 | paraffinic oil | 4 | JMS Stylet Oil (65564-1), Ultra-Fine Oil (862-23-499 | |
| sulfur | 24 | Kumulus (51036-352) | |||
| Combined 1 products | |||||
| 1 + M | thiophanate methyl + chlorothalonil | Spectro 90 (1001-72), ConSyst (48234-7) | |||
| 1 + M | thiophanate + methyl mancozeb | Zyban (58185-31) | |||
DISCLAIMER
Notice: The user of this information assumes all risks for personal injury or property damage.
Warning! Pesticides are poisonous. Read and follow all directions and safety precautions on labels. Handle carefully and store in original labeled containers out of the reach of children, pets, and livestock. Dispose of empty containers right away, in a safe manner and place. Do not contaminate forage, streams or ponds.
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