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Begin pruning your fruit tree when you plant it . The front of the adult beetle is dark metallic green , and it 's about 3/8 of an inch long . ' And yet , high quality , hardy pears are moderately easy to grow in the southern half of Minnesota — easier in some ways than apples . Because of this , if you have a confirmed case of Verticillium wilt ( check with your county extension office ) , remove and destroy the infected plant . Gooseberries and currants , although closely related , can easily be identified by examining the canes and fruit color ; gooseberry canes normally produce a spine at each leaf node and bear roughly grape-sized berries singly or in groups of 2 or 3 , while currant canes lack spines or prickles and bear 8 to 30 smaller fruit in clusters ( figure 1 ) . Within two weeks , a rust-colored pustule containing spores develops in the center of each spot on the lower leaf surface . If your irises have been unaffected in the past , you do not need to use an insecticide to protect them . Now consider two interferograms acquired over the same region as before but at different times , so that ground deformation ( due to an earthquake or volcano swelling ) has displaced many of the resolution elements for the primed interferogram in a coherent manner . Since this pathogen enters the stem through wounds , care should be taken to avoid stem injury . Diagnosis and control of this disease may be difficult since the fungus infects stems near the soil line and survives on old stem debris . Then dig a trench out from the base of each plant . Fungicide sprays may aid in controlling this disease . Flower blight of bedding plants is one of the first symptoms of this disease . Do not discard this debris in your compost pile . Remove individual flowers as they fade by cutting them off behind the stem swelling at the base of each bloom . A well-timed insecticide application can help reduce an iris borer infestation . Fourlined plant bugs are active for about a month ; there is one generation each year . The quality of the fruit from these disease-resistant trees is acceptable , although it may not measure up to that of some other varieties recommended in Table 1 for zones 4a and 4b . If the pH is too high for an extended period of time , the plants will die . If your goal is to have a supply of fruit to eat for snacks and desserts , you probably will want to choose an early variety and a later one , so that you are not overwhelmed by too many apples all at once . Drenching the soil with a fungicide such as thiophanate-methyl ( Cleary 's 3336 ) may help control some species of fungi . Control of this disease is best accomplished by preventing the entrance of phytoplasmas into the garden . Some home fruit growers construct chicken-wire cages around their fruit trees to keep deer from eating their trees in winter . Some apple varieties produce strongly vertical growth and need more training ; others tend to produce branches that are naturally well-angled . An unripe apple will be starchy and leave a sticky film on your teeth .