Gnomonia is a common disease in the cherry crops , is caused by the fungus Apiognomonia erythrostoma Höhn, 1918.
In wet environments, for obtaining quality cherries, the application of treatments with fungicides is essential.
It is one of the diseases of the cherry tree produced by fungi (Monilia , Screening and Anthracnose ). It is common that we find broad spectrum fungicide products. Thus, through the same treatment allows to control these usual fungi.
Biological cycle of the Gnomonia
Gnomonia has a cycle similar to Monilia. The infected plant remains of the fungus fructify in spring. During periods of rain the fungus emits spores that germinate on the leaves and fruits of the cherry tree.
Depending on the weather conditions, the symptoms of the disease will appear between 4 and 8 weeks after the infection.
Like other fungi, Apiognomonia erythrostoma, it proliferates under conditions of high humidity and mild temperatures. When these conditions occur, the application of fungicide treatments in spring is essential and we will have to make several applications during the campaign.
We can distinguish between two types of damage, those that affect the leaves and those produced in the fruit.
Sheets: chlorotic stains appear light green initially, which change to yellow-reddish during the summer. The leaves are reduced their photosynthetic capacity and fall to the ground before time, weakening the cherry tree.
Cherries: Reddish circular spots of appreciable hue are formed during veraison, but maturation hides them. In the peduncle you can see spots that reduce the quality of the harvest. The greatest damage is produced due to the fact that the fungus reduces the elasticity of the cherry skin. This in case of rains increases greatly the incidence of cracking or cracked.
Control and treatment of Gnomonia
In susceptible areas or with important infections in the past, it is advisable to eliminate or bury affected leaves and fruits. This measure should complement and never replace the chemical treatment.
Products authorized in the treatment of Gnomonia
Because the curative treatments are not effective. It is necessary to perform preventive treatments to reduce the presence of Gnomonia in our cherry plantation.
The treatments with copper oxides are essential during summer rest. It is advisable to carry out two treatments, one after the fall of the leaf a and another before the winter break.
These treatments have the advantage that can be authorized for organic farming.
Cupric hydroxide, Copper oxychloride, Cuprous oxide, Tribasic copper sulfate, Cupric-calcium sulphate…
Dodina 40%: Syllit Flow commercial product. Security term of 14 days. Suitable to also treat anthracnose.
Mancozeb 75%: For sale under the trade names Manefor ZN 75 WG, Dithane DG-Neotec and Kor 75 DG. 30-day security deadline. It also controls Monilia, Screening and Roya.
Mancozeb 80%: Micene WP, Ditiver M-80, Mancofit WP and Micene-L. With 30 days of security term. Allows additional control of Roya, Screening and Monilia.
Tiram 50%: Tirex Flow, Tiram Flow, Thisan 50 SC, Tisar-50 Flow, Thifit 50, Tiuram Flow and Deepest. It has a 15-day security period. The product is also used in treatments against Anthracnose, Screening, Monilia, Chancro and Mottled.
Gnomonia in Cherry Treatment and Control.
A significant part of the information, comes from Spanish research organizations. When phytosanitary products are used, it is important to verify that their use is currently authorized in the country of application.