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.
According to Auburn University, the most common pest problems to affect hydrangeas include Japanese beetles, red spider mites, aphids, leaf tiers, rose chafers and oyster scale. Each of these pests leaves distinct signs on a hydrangea, so diagnosing the pest problem is simple.