It colonizes the It can also affect apricots. Collar rot that is caused by the oomycete Phytophthora is causally called Phytophthora collar rot, and is a common disease of fruit and nut trees, as well as other flowers and crops. The following techniques are useful in managing apple crown and collar rot: Rootstock selection--Of the rootstocks preferred by growers, none is completely resistant to crown rot. Often a foul smell accompanies a bacterial soft rot infection. 111 rootstocks. When wounds are produced, fungi and bacteria can invade the host tissue. collar rot--infection above the tree union, crown rot--infection of the lower trunk and root bases, and; root rot--infection of the lateral and fibrous root system. Disease Management. Crown or collar rot has caused extensive death of apple trees in many eastern orchards during the past two decades. Crown and collar rots occur at the soil line where the plant emerges. It often occurs on trees between 3 and 8 years of age grown on Malling-Merton 104 (MM. Trees can be affected by root rot and crown rot simultaneously. If you fail with prevention and end up with root rot, all may not be lost if the plant in question is small enough (for example, a perennial rather than a big tree or shrub) and if you have caught the problem in time. In this zone, the plants must be able to withstand the freeze-and-thaw cycle as well as the mechanical abrasion of soil particles. Collar rot Hi Everyone If you grow citrus then you need to be aware of collar rot. Phytophthora collar rot results in girdling of the scions, which are the new growth shoots and twigs. Infected trees can develop a sunken canker that is gray, purple, or dark brown on the bark near where it was joined in grafting. Collar rot is a fungal disease caused by the Phytophthora fungus, affecting mainly apple trees. It is a fungal root disease that affects the base of the trunk. 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