PEAR TRELLIS rust is a fungus disease of junipers and pears. It is common in Europe, causing damage to the pear crop. In North America it is known to occur only in the Lower Fraser Valley, on southern Vancouver Island, in one county in California and now on the North Shore. The disease can be spread across great distances by transporting in- fected plants or within a local area through wind blown spores. It in- creases in severity and distribution in a local area when pear trees and junipers are planted close to one another. To prevent spread of the disease to commercial pear growing areas juniper-producing nurseries in the coastal area of B.C. must meet certain disease control require- ments. Having satisfied all these requirements, they can sell cer- tified junipers. All pear trees and most species of junipers in the coastal area can be affected by the disease. If you live fiear a nursery or garden cen- tre, inspectors may come around ty xpos? ry "vanes ou ue ® — |POTS & PLANTERS FROM THE 4 CORNERS OF THE WORLD ° Mexico ¢ Malaysia © Italy * Kelowna LANDSCAPE DECORSTORE has aE! pike “Frost Proat’’ models. if spats LIFESTYLES eware of pear trell during the summer to check the gathered in one location many unique and wonderful planters and pots in both glazed and ungtazed finishes. For year round use, choose from several pear trees in the area. If numerous pear infections are found, junipers may also be in- spected and, if found to be diseas- ed, they may be destroyed. in the more densely populated urban areas, where there are no juniper- producing nurseries, homeowners have to be on the lookout for the disease themselves as inspectors will not normally be working in those areas. The disease is easily detected on pear leaves but only with great dif- ficulty on junipers. Thus, it is usually the pear grower who first notices its presence. The first sign on pear is a bright orange spot on the leaf which first appears in late May. The spot enlarges during the summer, reaching’a diameter of one to two cm. By late June, the centre of the spot exhibits numerous black dots on the upper Jeaf surface. In July and early August, the infected area of the leaf becomes thickened as spore-producing structures push out from the lower surface. From late August through leaf drop in October or November, grey hair-like projections resembl- ing trellises emerge from the lower surface and release spores. These spores are capable of infecting junipers. The only time that infections are obvious on juniper is during wet weather in April and carly May. At that time, swellings on the juniper branches release an orange jelly- like mass of spores. These spores are capable of in- fecting nearby pear leaves which are just starting to grow. After the spores are released, the infection on juniper remains dormant until the next spring. There are various ways to con- trol the fungus, including: 1) Purchase junipers bearing a certification tag. This is your only guarantee of obtaining disease-free plants in the coastal area. This is particularly important if you are planting in a new subdivision or if you are taking plants outside the coastal area. 2) It is unlawful to move uncer- tified junipers or pear trees outside of the coastal area or from Greater ae ae = 3 = Cr) a | rst) =. — g i=) = & {LIFESTYLES is rust B * ideal for exposed aggregate and pavingstone patios, walkways and i hs LANDSCAPE DICORSTORE Victoria-Saanich Peninsula area to any other part of the coastal area. 3) Plant junipers and pears as far away from one another as possible. Consider your neighbor's plants, as well as your own. 4) Hf leaf infections are scen on pears outside of the Lower Fraser Valley or Southern Vancouver Island, report them at once to your local garden centre or Ministry of Agriculture and Fisheries office. 5) Uf leaf infections are seen on pear in the coastal area, carry out a neighborhood survey to deter- mine the number of pear trees and the likely location of infected junipers. If an agreement between neighbors can be reached, a neighborhood with many pears but few junipers would benefit by removing the junipers and replac- ing them with other ornamentals. In neighborhoods with a few pear trees and many junipers, fur- ther spread of the disease can be prevented by removing the pear trees or by removing the infected pear leaves before mid-August each year. 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