Spirotetramat to control myzus persicae (Sulzer) on peach in Emilia-Romagna (Italy)
2015
Pasqualini, E. | Scannavini, M.
The green peach aphid M. persicae is a common pest of stone fruits (primary host), but it is a very serious problem on vegetable crops (secondary hosts), because the summer generation could be vectors of several important virus diseases (more than an hundred) on many vegetable crops. The green peach aphid overwinter in Italy mainly on peach as egg and late in winter or in spring attacks flowers and shoots. In late spring it moves to other hosts, which include a wide range of weeds and commercial vegetable crops. In Emilia-Romagna the first nymphs appears on peach normally during the flowering, or a little bit after, and can damage the fruits. After two generations on peach the winged forms appear and migrate to summer hosts, where many other generations run. Depending from appearance, population level, variety and natural control normally a spray at pre-bloom is planned, but a post-bloom spray could be a right time also. To control of M. persicae at post-bloom period 3 field trials were carried out during 2012/2013 springs in 2 different farms on 3 nectarine peach varieties. One of the aphid populations was resistant suspected to neonicotinoids. The insecticides used were: spirotetramat (Spirotetramat), 2 neonicotinoids: imidacloprid [Confidor-O TEQ], thiametoxam [Actara] and 1 pyridinecarboxamide: flonicamid [Teppeki]. The results were similar in all trials and showed an excellent and long lasting (persistence) activity of spirotetramat and a good efficacy of flonicamid, but for a shorter period, as well as the 2 neonicotinoids in all trials.
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