Scab of apple and pear: the best control measures


Scab of apple and pear is a very common fungal disease in the conditions of home gardening in our country. If the pathogen Venturia inaequales Wint causes the apple tree disease, the pear plantations are affected by Venturia pirina Aderch.

Features of the disease

Such popular seed crops as apples and pears, subject to agrotechnics and preventive treatment, are not too often affected by scab. However, in order to reduce the risk of the disease and choose the most effective control measures for the treatment of fruit stands, you need to know some features of the disease:

  • the causative agent of this common disease goes on wintering in the phase of the immature fruiting body, or pseudothecia;
  • pseudothecia are able to form on fallen foliage, as well as the fruits of the seed crop;

  • spores are scattered at the initial stage of growth of branches and shoots of fruit crops;
  • the spore membrane has a characteristic mucous membrane, which contributes to the fastest and easiest attachment of the pathogen to the leaves;
  • spores germinate in the space between the cuticle and epidermis in conditions of high humidity and insufficient temperature indicators;
  • after about two weeks, the infection passes to the conidial stage, and a secondary lesion of the foliage of the fruit crop occurs.

After the active leaf fall stage, the fungal infection continues its active development in the form of a saprotroph. In order to properly treat the affected plant, it is necessary to timely detect the appearance of the disease and assess the extent of the harmfulness. It should be remembered that it is necessary to deal with scab in a timely manner, otherwise even the most powerful and modern chemical agents will not be able to guarantee a favorable outcome.

Apple scab control methods

Signs of defeat

The scab of pear plantations differs from the scab of apple trees by the type of pathogen of fungal infection, but the signs of the manifestation of the disease are almost the same. The first signs of scab lesion are the appearance on the freshly blossomed leaflets of small light green, oily, spots appearing near the veins. After a while, a brownish-olive velvety coating appears on the surface of such spots.

On the leaves of the apple tree, spots are located on the upper side, and if the pear is damaged, spots can be observed on the lower side of the foliage. Significantly affected leaves first dry out, and then fall off, regardless of the time of year.

Infection of the fruit comes from foliage. In this case, dark spots with a light border appear on the surface of a rounded shape. The surface of the spot is an olive-brownish, velvety coating. Fetal tissues in the affected areas become corky and crack. Affected fruits are deformed, and on the stalks and ovaries spots are scabs of small sizes, dark in color, with velvety. Ovaries infected with scab stop in development and fall off the tree.

The presence of moderate moisture indicators contributes to a certain shift in the timing of the lesion. In this case, the bark on the plant is covered with medium-sized swellings, and then a period of cracking and peeling sets in, which very often ends with a fairly quick dying off of the shoots. On the fruits appear small in size, rough to the touch, dark brown color spots.

The best remedies and dosage

Apple and pear plantations can be affected by scab at almost any age, but such a fungal disease is especially harmful for young plants. Fruit plantations can be processed both by chemical and folk remedies. As a rule, folk remedies are used at the initial stage of the disease, as well as for preventive purposes. It is very important to plant fruit trees with different resistance to fungal infections.and also to observe the optimal distance between plants during planting and timely thin out thickened tree crowns.

Used remedyTerms of useConsumption rateProcessing Features
Alirin-BSpraying of fruit stands during the period of active vegetationWettable powder at the rate of 6-15 g per hundred square meters of garden plantingsIt is necessary to carry out two-time processing with an interval of two weeks
GamairAt the stage of the pink bud, immediately after flowering, at the phase of the formation of fruits the size of a hazelnutThe average consumption is 2−5 l per tree and may vary depending on the age of the plantings and varietal characteristicsDilute the working solution at the rate of 10 tablets per 10 liters of water. It is necessary to carry out triple processing
"Speed"Treatment before and after flowering with an interval of two weeksThe average consumption is 2−5 l per tree and may vary depending on the age of the plantings and varietal characteristicsDilute 2 ml of concentrated emulsion in 10 l of water and spray twice
StrobesSpraying of fruit stands during the period of active vegetationThe average flow rate of the working fluid is about 12-15 l per one hundredth of fruit standsThis drug should be used in combination with other fungicides.
"Bordeaux mixture-GRP"Processing of plantings in the early spring, before and during buddingThe average flow rate of the working fluid does not exceed 10-15 l per hundredFor spraying, use a 3-4% working solution of the drug
Abiga PeakSpraying of fruit stands during the period of active vegetationTo prepare the working solution, 50 g of the drug should be diluted in 10 l of waterFour-fold processing of stands is carried out with an interval of three weeks
Poliram-DFThe first treatment in the green cone phase, the second spraying on a pink bud, the third treatment at the end of flowering, and the fourth - on fruits the size of a walnutThe average flow rate does not exceed 15 liters per hundredThe final processing should be carried out no later than two months before the harvest

Preventative treatment

It is recommended to carry out timely trimming of the crown, which will ensure the necessary level of ventilation. Particular attention is required to remove sources of infection. It is imperative to remove fallen leaves and fruits. Foliage collected after autumn leaf fall is undesirable to dig in the soil of trunks. It is best to burn all the garbage collected in the autumn period or to put it in a compost heap.

Scab on a pear: the main signs

It is very important to conduct regular inspections of fruit stands and timely prune and destroy all affected branches and shoots. Trunk circles around the trees of apple and pear, must be free from any weed vegetation and mulched with quality humus or peat. Timely implementation of preventive measures aimed at preventing the defeat of fruit plantations by scab, minimizes the risk of infection and maintain the health of garden plants.



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