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1990. Fruit infections (sprinkler rot) of pear and apple was widespread in the Wenatchee River Valley of Washington when overhead sprinklers were common (1992–1999). Collar rot may appear as a dark brown, grey, or purplish depressed canker on the bark of the lower part of the scion which can be confused with fire blight (Figure 4). Fubol Gold should be applied post harvest but before green cluster stage. Bielenin, A. and Jones, A. L. 1988. Phytophthora spp attack the roots and trunks of apple trees and are responsible for crown, collar and root rots of apple trees.. Phytophthora cactorum is the main species responsible for crown and collar rot. 86:199-204. Planting high grafted trees (minimum 40-70 cm above soil level), or trees with resistant interstocks, will ensure that susceptible scions are less prone to infection by soil splash. Do not control with a copper spray program. 75:406-409. Flett, S. 1996. Other problems that may be confused with crown and collar rot. Fruit is often small and colours prematurely. M-7 and MM-111 are moderately susceptible; M-26 and MM-106 are susceptible; and MM-104 is highly susceptible (Table1). Mahaleb is the most susceptible cherry rootstock, whereas Mazzard, Morello, and Colt are somewhat more resistant and would be recommended on heavier soils. Irrigation water can be a source for Phytophthora infections. Adding organic matter in the form of compost, trimmings, grass clippings, and other material will build organic matter over time. Trees are therefore attacked at about blossom time (April) and during the onset of dormancy (September). Utkhede, R.S. Proper water management is the key to controlling root and crown rot. Most significant is that strawberry crown rot is caused by a specific strain/pathotype. “Preplant root treatments to reduce the incidence of Phytophthora species on dormant apple rootstocks.” Plant Disease no. After cutting away the outer bark, a sharp line of demarcation is commonly apparent between the healthy and diseased (orange-brown) tissue. M.9 appears most resistant, but reports suggest regional differences in rootstock susceptibility. Infection of apple tissue takes place mainly at the soil surface and tissues at greatest risk of infection are those in contact with the soil or within the range of soil splash. Crown or collar rot has caused extensive death of apple trees in many eastern orchards during the past two decades. When over-head cooling is not properly cycled, soils may remain wet or saturated during the cooling season of July and August greatly increasing the risk of infections. It is often seen in low lying areas of poorly draining soil. Where collar rot lesions are not too advanced, control can be achieved by cutting out all bark in the affected area, including at least 5 cm of healthy tissue to expose the sapwood. Also drainage may be locally poor when trees have been badly planted in post hole bores. Monitor soil moisture and limit the amount of time a soil stays saturated. Yamak, F., T. L. Peever, G. G. Grove, and R. J. Boal. You, the grower, are responsible for safe pesticide use. However, examination of the tissue under the bark, especially the wet orange/red-brown rot, usually distinguishes collar rot. Remove the soil from around the trunk and look at the crown. Collar rot, particularly when lesions are well advanced, may be confused with other wood rotting fungi, such as some of the bracket fungi. Keep soil away from the graft union and avoid mechanical damage to the trunk. Both diseases are caused mainly by P. cactorum and are favoured by wet weather. Always read the label before using any pesticide. 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