Crown or collar rot has caused extensive death of apple trees in many eastern orchards during the past two decades. It colonizes the union – the swollen part at the base of the trunk marking the join between the rootstock and the upper part of the tree – and can cause the death of the tree by completely girdling the trunk. It causes the base of the trunk to rot and flake off, gum to ooze out, cracking in the trunk, leaves to go yellow and if it is really really bad the tree … 106, and, to a lesser degree, MM. Crown and collar rots occur at the soil line where the plant emerges. It can also affect apricots. Often a foul smell accompanies a bacterial soft rot infection. Phytophthora collar rot results in girdling of the scions, which are the new growth shoots and twigs. 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. Collar rot Hi Everyone If you grow citrus then you need to be aware of collar rot. It is a fungal root disease that affects the base of the trunk. Collar rot is a fungal disease caused by the Phytophthora fungus, affecting mainly apple trees. When wounds are produced, fungi and bacteria can invade the host tissue. 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--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. It often occurs on trees between 3 and 8 years of age grown on Malling-Merton 104 (MM. 104), MM. Disease Management. 111 rootstocks. Trees can be affected by root rot and crown rot simultaneously. 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