Stone fruit bacterial diseases: apricot
The most common bacterial disease of the Apricot tree is the sudden or chronic "wasting". In Italy, this syndrome normally affects plants located in Emilia Romagna and Piedmont and its parthenogenesis is attributable to some specific pathogens, such as Pseudo-monas syringae and viridiflava. To avoid this type of very frequent problem, it is essential to preserve the plants from severe winter colds and frosts, avoiding grafting the Apricot tree in too heavy soils. An important role is also played by the pruning operations that should always be performed in late summer in order to make it less easy for bacteria to penetrate into the cracks in the trunk. Among the bacterial pathologies affecting the Apricot tree, there is also the so-called "fruit scab" which also affects other Drupaceae.
Bacterial diseases of stone fruit: the peach tree
The most dangerous pathogen for the Peach tree is undoubtedly Xanthomonas arboricola, responsible for the bacterial maculation. This bacterial disease is widespread in much of Italy, although in the southern areas it occurs less frequently thanks to the mild climate that counteracts its virulence. Among the triggering causes of "bacterial spotting" are: excessive use of nitrogen and potassium in plant fertilization, an incorrect irrigation method and too high a density of plants in the same soil. To prevent the onset of this annoying bacterial disease of stone fruit it is important to treat plants with copper-based products because this substance greatly reduces the risk of the bacterium penetrating inside the leaves. Furthermore, the disinfection of the tools used for pruning is essential.
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Bubble on stone fruit
The plum tree
Among the bacterial diseases of stone fruit that affect the Plum tree, the most widespread is undoubtedly Xanthomonas arboricola. Unlike what happens in the Peach tree, in the Plum tree there are often damage to the trunk and branches, where wilting and cancers originate. Bacterial mottling affects different regions of the plant, infecting twigs, fruit and leaves. In this case, the foliage takes on characteristic reddish rounded formations and surrounded by a yellow halo which, later on, form holes. The disease mainly damages young plants, compromising their development: the leaves begin to fall and the branches suddenly dry up. To avoid this type of problem, it is important to carefully remove infected branches that need to be burned immediately.
The cherry tree
The cherry tree is quite resistant to bacterial diseases, but the most common ones are caused by improper pruning that allows bacteria to colonize the plant. This leads to the drying of the branches and the formation of cancers in the trunk and branches. The main symptom is a conspicuous emission of rubbery substance that can cause the plant to die. At first the leaves curl and then turn yellow and fall off prematurely. The "gummy cherry" or "Corineo" is a bacterial pathology induced not only by incorrect pruning but also by a soil with an inadequate pH, sudden water stress, lack or excess of nutrients. In the presence of gummy bears, a good remedy, to always be performed before flowering, is to pass copper sulphate over the cracks in the bark, repeating the operation regularly and especially after each rain.
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