Abstract
The investigations were made in the experimental sour cherry orchard from the Institute of Agriculture, Kyustendil, Bulgaria, during the period 2010-2014, in order to compare conventional and integrated sour cherry protection against cherry leaf spot and cherry fruit fly. Two variants were investigated, with two different treatment approaches for the control of cherry leaf spot and cherry fruit fly. Variant 1 – cherry leaf spot was controlled by protective treatments with dodin and tebuconazole + trifloxystrobin and cherry fruit fly was controlled by treatments with deltametrin and thiacloprid, independently of density. Variant 2 - cherry leaf spot was controlled by post-infection (curative) treatments with tebuconazole + trifloxystrobin and cherry fruit fly was controlled by treatments based on biological threshold: 10-11 cherry fruit fly females caught in traps up to the moment for chemical treatment. It was established that Blumeriella japii can be successfully controlled by post-infection treatments and by this the number of insecticide treatments was reduced. The treatments against cherry fruit fly can be avoided or reduced when the attack control is based on the biological threshold established in the studied area.
Highlights
The soil, climatic and topographical conditions in many region of Bulgaria are favorable for sour and sweet cherry cultivation, with proper conditions for the production of high quality fruits
There are numerous fungi and pests that attack sour cherry, but cherry leaf spot caused by Blumeriella jaapii, blossom and twig blight caused by Monilinia laxa, fruit rot caused by Monilinia fructigena and Monilinia laxa are the most important fungal diseases (Borovinova, 1998, 2006; Edson et al, 1998; Feldmane, 2011; Gelvonauskienė et al, 2004; Holb, 2003, 2004; Schuster, 2004)
Variant 1 (V1) - cherry leaf spot was controlled by protective treatments with dodin and tebuconazole + trifloxystrobin, while cherry fruit fly was controlled by treatments with deltametrin and thiacloprid, independently of density
Summary
The soil, climatic and topographical conditions in many region of Bulgaria are favorable for sour and sweet cherry cultivation, with proper conditions for the production of high quality fruits. Application of post-infection (curative) treatments for cherry leaf spot and economic threshold for the control of R. cerasi are effective methods for reducing the number of insecticide treatments (Borovinova and Sredkov, 2006). The use of yellow sticky traps, crop netting, foliar applications of Naturalis-L (B. bassiana) are most suitable for the organic cherry production (Daniel and Grunder, 2012; Daniel, 2014). The aim of this investigation was to compare conventional and integrated sour cherry protection against cherry leaf spot and cherry fruit fly
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