Can large cranberry fruit rot be controlled without chemical plant protection products?
2022
VilkaVilka, Līga, Liga | SilinaSiliņa, Dace, Dace
North America is the main growing region for large cranberries (Vaccinium macrocarpon), but they are also grown in Chile and eastern and central Europe. Fruit rot is the main threat to large cranberry production in all growing regions. The efficacy of chemical control is variable because the disease is caused by a complex of pathogenic fungi. In Latvia, very few plant protection products for control of the diseases in plantations of large cranberry are available (some chemical and one organic product). Currently, there have been practically no studies on the use of organic protection products in the control of large cranberry fruit rot. The trial was carried out from 2019 to 2021 in a cranberry plantation planted in 2013, using three cultivars ‘Stevens’, ‘Ben Lear’ and ‘Pilgrim’. The aim of the work was to compare the plant protection schemes for limiting the spread of the most important cranberry fruit rot, using chemical and organic plant protection products. The results showed that only in 2019 significant differences were found between the variants: in the mulch and the combined variant the spread of fruit rot was significantly lower (respectively 22.7% and 38.7%; p=0.01) than in organic variant (70.3%). The cultivar ‘Ben Lear’ has a lower prevalence of fruit rot than the cultivars ‘Stevens’ and ‘Pilgrim’, especially in 2020 and 2021. During harvest and storage, mostly berries with disintegrated consistency (caused by Fusicoccum putrefaciens and Coleophoma empetri) were common.
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