|
|
|
PestsThe key to successful biocontrol is proper identification of the pest and early introduction of the appropriate natural enemy. The most common pests found in tomato greenhouses in the mid-Atlantic region have been thrips, whiteflies, and fungus gnats. There have been occasional infestations of tomato pinworms, fruit worms, aphids, and spider mites. Many of the pest problems occur later in the growing season, if greenhouses start pest free. This is possible because most growers do not start planting until November or December, usually after the first hard frost. Fungus gnats appear to come with the growing media (pink bark mix or coconut fiber) and can become a problem within weeks of transplanting. Whiteflies and thrips can easily be introduced on the clothing of visitors. It's best to keep visitors out of the greenhouse. Garden centers and houseplants often harbor insect pests that have developed resistance to pesticides. Plant diseases and disorders are sometimes transmitted via insect feeding. Several common species of thrips transmit Tomato Spotted Wilt Virus. Whitefly feeding may cause plant disorders and their excretion of excess sugars results in black molds and sticky fruit. The placement of yellow sticky cards placed thoughout the greenhouse is an effective way to monitor for early signs of many pests. The photos provided for these pests are those taken from yellow sticky cards. This provides a more realistic view of the first encounters most growers have with these small pests. Web sites links are provided for pictures of living insects. |
