Inspect Incoming Poinsettia Cuttings – carefully inspect poinsettia cuttings (each batch, if possible) to insure that they are free of insects and diseases and are of the quality you expect. Look for whitefly eggs and nymphs on the underside of the leaves. (Adults are rarely found on the cuttings). For the latest information on whiteflies, including the highly resistant Q Biotype of the silverleaf whitefly see www.q-biotypewhiteflies.com
Look for fungus gnat larvae and signs of their feeding damage (blunt root tips). Roots should be white and healthy with no signs of root rot disease.
Thrips Damage on Garden Mums – look for distortion and white scarring on the leaves. You can tap foliage over a sheet of white paper to look for the adults and larvae. This foliar damage will be masked once the plants are in flower.
Aphid predators – I have been seeing various aphid predators (such as hover fly adults) near spot outbreaks of aphids on garden mums and other crops. Adults resemble a small wasp or bee. The maggot like larvae feed upon aphids. Ladybird beetles and lacewings will also feed upon aphids. With all the wet weather we have been having, fungal diseases can also help keep aphid populations in check.
To help identify some of the beneficial natural enemies (especially prevalent on outdoor crops if few or only selective insecticides are used) See Flash Cards: Good Guys: Natural Enemies of Insects http://www.inhs.uiuc.edu/chf/outreach/eduresources/eduflashcards.html
| June 26, 2009 |
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| February 4, 2009 |
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