Chilli thrips, mites and Florida wax scale spotted in August

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Photos by Chazz Hesselein, ACES

 

Inspection Report Week of August 15, 2016

Phytophthora root rot was diagnosed in boxwoods at two locations.

Florida wax scale was seen in various stages of development including crawlers (left) and the early cameo stage, as well as adult scale not producing eggs and crawlers yet. This might indicate that we are

not seeing a distinct emergence like we see in some years. Two sprays several weeks apart may be needed to control this second generation. The cameo stage (right, very small scale) is the best time for control. A good way to monitor them, besides looking at them in the field, is to keep an infested branch in a glass of water for observation.

Chilli thrips is making a big comeback. In previous weeks they were seen on pieris, mahonia ‘Soft Caress,’ and cleyera. This past week they were seen in especially large numbers on distylium. They were also seen on cleyera, camellia sasanqua tips, barberries, ‘Sunshine’ ligustrum, variegated false osmanthus, aucuba, Umbellata minor, pittosporum, and Indian hawthorn.

Mites were heavy at one location on azaleas (Gumpo, Conversation Piece, Amagasa, and others) and junipers. Species seen included lots of two-spotted mites, red mites, and whatever mite likes to attack junipers. Tapping foliage over a white surface is a good way to scout for mites.

Broad mites were suspected in twisted nandina foliage. John Olive said it only takes a few to cause damage, they are microscopic, and hard to find. Treatment with a miticide registered for broad mites followed by normal growth was how I knew it was broad mite when I was dealing them when I worked in nurseries. In the picture below, damage was progressively worse as mites increased. After a spray treatment, normal growth resumed.

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Albert Van Hoogmoed ADAI