Problem
During the last 2 weeks of July, several hemp samples were received and evaluated by specialists at the University of Kentucky (Lexington and Princeton). Hemp russet mites (Aculops cannabicola, Acari: Eriophyidae) (Figure 1) were observed on nearly all of the samples. Mite infestations originate in the greenhouse and outdoors and can become a serious problem for hemp growers when population outbreaks occur.
Description of feeding damage by hemp russet mite
In greenhouse settings, small populations of hemp russet mites can go unnoticed. However, when populations increase, curling leaf margins can easily be identified (Figure 2, see older leaves) – similar injury can also be caused by broad mites (Tarsonemidae), which will be discussed at another opportunity. When population outbreaks of russet mites occur in shoots, and developing leaves, they appear brown or golden colored (Figure 2). Later, the foliage may become brittle and break easily at the petiole…
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