Humans have co-existed with leeches for so long, according to Siddall, that just about every language has a word for leech. 3. theyâve made a comeback in medicine.
The lettuce aphid is a problem worldwide and has recently become problematic in the western United States and Canada (Liu and McCreight 2006; McCreight 2008). However, the first three species of aphids listed above are most economically damaging in Florida (Nuessly and Webb 2010). Although heavy aphid pressure can stunt plants, the major problem aphids cause is head contamination, which makes lettuce unmarketable.
Summary: Aphids, sometimes called greenfly, are small insects that suck plant juices from stems and leaves and can severely stunt or even kill their host plants. Early detection and control with insecticidal soap are the keys to managing aphids in greenhouses, house plants, gardens, and landscapes.o get enough of the protein that they need aphids must take in a lot more sugar (plant sap) than they can use -- excess sugar is expelled through the body as a concentrated sugar solution called honeydew. This honeydew may drip from the plant and attract sugar-loving insects like ants and wasps.