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.
The soybean aphid, a native of Asia, has been in the Midwest since 2000 and has quickly become the most serious pest of soybeans in much of Indiana. These aphids are small (less than 1/16 in length), yellow-bodied insects with distinct black cornicles, and may be either winged or wingless.ampling for soybean aphid should begin once aphids are first noted in soybeans during the spring. Because movement to soybeans is often sporadic and difficult to predict, we offer season-long updates on soybean aphid emergence numbers at Purdue's weekly Pest&Crop newsletter, available for free download.