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Care must be taken in observing that symptom development is consistent with Botrytis infection . An important result of PHC is that roses in healthy condition are less impacted by insects than plants under stress . Spots on the leaf may occur along the veins as well as on the tissue between the veins and on the petioles . 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 . Cultural measures such as improving air circulation , watering midday and watering only at the base of the plant ( do n't get the leaves wet ) will greatly reduce infection . The main distinguishing feature between the two species is that the Japanese beetle has five tufts of white hair along both sides of the abdomen and two small dots of white hair on the tip of it . To manage fourlined plant bugs , spray a labeled insecticide , such as acephate ( Orthene ) , diazinon , chlorpyrifos , carbaryl ( Sevin ) or malathion as soon as you see damage in May or June . Infected leaves initially develop water-soaked ( dark green ) spots , which later enlarge and brown , forming streaks along the midvein of the leaf . Consider again two radar antennas observing the same ground swath as in Fig. 2.1 but at different times , as in the repeat-pass mode . Representative trade names may be included along with generic names . Although other leaf spot and leaf streak diseases do occur on daylilies , it is unclear whether any of these problems are caused by fungi . Cankers may appear along the stems and cause them to fall over . Currants and gooseberries are self-fertile , but research suggests that planting more than one cultivar results in better yields . Whether the fruiting variety is grafted onto standard or dwarfing rootstock , the fruit size and quality will be the same . It is unlikely for geranium rust to survive winter outside in Minnesota , but removing infected debris may help prevent infections the following spring . Narrow fastenings such as wire or cord may cut into the thin bark . When control is necessary , sprays of wettable sulfur or thiophanate ethyl , also known as Clearys 3336 , may be effective . When using the fruit for jam , you should harvest it before it is fully ripe so that natural fruit pectin levels will be higher .