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Sanitation in July is critical if you are having problems with iris borer . Infection first occurs on the lower leaves and then progresses upward to involve the entire plant . Symptoms are visible as small yellow leaf spots , within one week after the initial infection . In addition to rain splash and wind , spores can be spread by tools , hands , or clothing . Dwarfing rootstocks reduce tree size by up to 75 % , so that a tree may be only 8 , 12 , or 15 feet tall when mature , depending upon its rootstock , scion variety , and growing conditions . In addition to broad host range , there are few effective nematicides labeled for home use . Clematis is subject to infection by several diseases including powdery mildew ( Erysiphe ploygoni ) , crown gall ( Agrobacterium tumefaciens ) , and various leaf spots ( Cercospora squalidula , Septoria clematidis ) . These beetles also attack blackberry , clover , coreopsis , hollyhock , honeysuckle , iris , lilies , and peonies and vegetables such as peas , beans , cantaloupe , corn , and cucumbers . Because currants and gooseberries do not perform well under dry or waterlogged conditions , most soils will benefit from the addition of organic material such as shredded peat or compost before planting . This removes and kills overwintering eggs , minimizing the risk of iris borers next year . Average fruit size is 1 _ to 2 inches in diameter and 2 to 2 _ inches in length . The rootstock , on the other hand , plays a major role in determining the tree 's ultimate size and how long it will take to bear fruit . In addition , remove any weak new growth . Despite the effort required , apple trees in particular remain a popular addition to many home gardens . All of these disease organisms will cause iris leaf tips to brown and iris plants to senesce , mimicking symptoms caused by iris borer . There are several iris diseases with similar symptoms that can occur when iris borer is absent , including bacterial soft rot , iris scorch ( probably caused by a phytoplasma ) , and fungal leaf spot ( Didymellina macrospora ) . The adults are about the same size as the false Japanese beetles but are more iridescent with a metallic green head and thorax and shiny coppery brown wings . Iris leaf spot is a common disease caused by the fungus , Mycosphaerella macrospora ( formerly Didymellina macrospora ) . A fungicide can be applied to protect new shoots , leaves and buds from infection . The fuzzy fungal spores , produced after rain or watering , are characteristic of Botrytis infection ( Figure 1 ) .