Efficacy of Spirotetramat in the Control of Pear Psylla (Cacopsylla Pyri L.) on Pear Trees in Poland

Abstract

The effectiveness of spirotetramat in the control of pear psylla (Cacopsylla pyri) on pear trees was investigated in five field experiments, carried out in years 2009- 2011. One or two treatments were applied in June; the first treatment in the early stage of larvae hatching from eggs deposited by females from the summer generation, whilst the second application was carried out about two weeks later. In all the experiments, spirotetramat as Movento 100 SC applied at a dose of 2.25 l/ha effectively reduced the pest population after only a single application (total reduction of larvae after one week post-treatment 75.3-91.4%, and 83.7-97.6% at two weeks posttreatment). Movento 100 SC applied after a single application at a lower dose of 1.8 l/ha had a slightly worse effect (the total reduction of larvae at one week posttreatment was at the level of 58.4-91.3%, and two weeks after application at the level of 56-92.6%) - but in this case only a few larvae at stages L4 and L5 were found on pear shoots. The effectiveness of spirotetramat at both doses after two applications was very high.In comparison with standard insecticides the efficacy of spirotetramat was higher or not significantly different. In two experiments the application of standard compounds such as diflubenzuron and novaluron was not effective in controlling pear psylla and therefore did not prevent damage to pear trees. This may suggest that local populations of the pest are resistant to these measures, especially since they have been used for many years to control other pests of pear trees

Seasonal variation in susceptibility of the pear psyllid, Cacopsylla permixta (Hemiptera: Psyllidae) to selected insecticides

“…Given that in summer, the second‐ and third‐generation psylla population, and thereby honeydew amount, increase, and successful control will be harder. Erler and Cetin () reported that treatment of overwintered adults with insecticides is too effective to control C. pyri , but according to the present study, and similar reports about C. pyri (Bues et al ()) and C. pyricola (van de Baan et al (); van de Baan and Croft ()) have shown the best period for insecticide treatment for efficient control is treatment against the first generation, at the time when eggs are laid by females as well as during the egg hatching and the larvae appearance (Jaworska, Olszak, Łabanowska, & Korzeniowski, ). At this time of year, there is not much honeydew yet, and psylla are more susceptible, which would likely lead to better results and the reduction in damage during the next summer.…”

Efficacy of spirotetramat in the control of the currant-sowthistle (Hyperomyzus lactucae l.) on blackcurrant plantations in Poland

“…Reissig and Combs (2009) reported on high affectivity in the controlling of San Jose scale, green apple aphid and wooly apple aphid after treatment with Movento 240 SC. According to Jaworska et al (2012) Movento 100 SC also showed high efficacy in the control of pear psylla on pear trees. It is important for the integrated plant protection management that on plants treated with spirotetramat, some beneficial fauna such as Phytoseiidaelarvae and adults as well as eggs were noted.…”

“…Promising results in the control of aphids and other pests were obtained using the new product spirotetramat as Movento 100 SC, developed and introduced by Bayer CropScience (Cantoni et al 2008). Application of Movento 100 SC also reduced pear psylla population (Cacopsylla pyri L.) on pear trees (Jaworska et al 2012) and strawberry mite (Phytonemus pallidus Banks, syn. Tarsonemus fragariae Zimm.)…”

Untitled

“…Seven psylla control treatments were performed during 2017, while there were six treatments (Tables 1, 2) during 2018, considering the possibility of weather conditions, as well as critical thresholds. In Croatia, a need for extra psylla control treatments is evident especially during the summer months, being in contrast to Poland, where only several treatments are usually carried out because of their possibility to control the first generation (Jaworska et al, 2012). In Turkey, usual practice against psylla is the appliance of six to eight insecticidal treatments per year (Erler et al, 2013), very similar to the Croatian practice.…”