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1.  Botrytis Blight is the most common and destructive fungus of peonies. Young stems and leaves turn black, wilt and die. Later young flower bulbs turn black and die. Flowers that are attacked fail to open and may become a brown rotted mass. This can be controlled by repeated applications of Captan or other recommended fungicides beginning in early spring.
2. Leaf and Stem Spot (Measles) causes dark purple spots on the upper surface of leaves
and some times on stems. Undersides of leaves may turn chestnut colored. Spray the ground with a I% solution of  Mancozeb or other suitable fungicide.
3. Ants do not cause direct injury but are carriers of disease. These can be killed by dusting the
ground and ant hills with Permethrin granuals.
4. Thrips are tiny insects  which feed at the bases of flowers. For protection spray with any good insecticide, paying special attention to buds.
5.   Rose Chafer, a long-legged tan colored beetle about ½ inch long feeds on the flowers, leaving large holes in the petals and destroying the flowers. Use any good insecticide.
6. Rose Curculio is a bright red snout beetle much smaller than the rose chafer. Use a good
general purpose insecticide.
7. Japanese Beetle is iridescent bronze and green insect which eats buds, blooms and leaves
in mid-summer. Use Sevin or other general-purpose insecticide.
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