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The same insects that are pests of apple — codling moth , plum curculio and apple maggot among them — may harm developing pear fruits as well . 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 . Leave more fruit on the outer portion of the tree and less in the shaded center , where it will not get good sunlight . Adults are greenish yellow with four black stripes down the wings . Because you want your new shrubs to become established before the onset of hot weather , set out either bare-root or potted plants in spring as soon as the soil can be worked ; do not be afraid to plant early in the season , as even a plant that is beginning to leaf out can tolerate temperatures as cold as 19 F. At the end of the growing season , cut back and remove infected foliage to prevent fungal spores from surviving winter in plant debris . 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 ) . They've also been seen in St. Paul , Stillwater , Hastings , Rochester and Winona , according to Doree Maser of the Minnesota Department of Agriculture . Large systematic errors like this are likely to be more common in areas of higher relief and throughout much of the Southern Hemisphere . Remove weeds ( many act as reservoirs for the microorganism ) and monitor plants for leafhoppers . Symptoms of flower or bud blast begin as irregular gray / brown spots on the petals , whereas buds turn brown and / or have a water - soaked appearance . Remove individual flowers as they fade by cutting them off behind the stem swelling at the base of each bloom . In April , begin to uncover mounded or tipped roses by removing the leaves or straw as they thaw . When the sun goes down or behind a cloud , the liquid water suddenly freezes , damaging the cells and sometimes killing all the conductive tissue on one side of the trunk . It feeds upon numerous plant types , including flowers ( particularly roses as well as flowers such as peony and dahlia ) and fruits ( e.g ., grape , raspberry , and strawberry ) . Sanitation - - or removal of any spent flower blooms , infected buds , leaves and stems - - is best done during a dry , calm time of the day . Cool picked fruit quickly , placing it in covered containers or closed bags to maintain humidity levels and prevent drying when storing fruit in a frost-free refrigerator .