How to Protect Raspberries From Didimella?
Agrotechnical and chemical methods are used to protect raspberries from didimella. Crucial in the fight against purple spotting are the timeliness and complexity of agricultural activities:
- correct site selection
- soil preparation before planting,
- the use of healthy and high-quality planting material,
- selection of zoned and resistant varieties,
- support of a high level of agricultural technology.
The soil content under green manure reduces the number of weeds. Repeated sowing of white mustard with subsequent incorporation of green mass into the soil allows you to clean the wheatgrass area and reduce the number of other perennial weeds. This agricultural technique also contributes to the enrichment of the soil with organic matter and improves its water-air regime. It is possible to increase the immunity of raspberries to pathogens with the help of fertilizers.
The use of phosphorus-potassium fertilizers in scientifically based standards significantly reduces the number of raspberry stem gall midges and other sucking insects. At the same time, the biochemical composition of the cell sap of plants that the gall midges feed on changes, as a result of which their development is suppressed. The inhibitory effect on the causative agent of the disease is exerted by ammonia forms of nitrogen fertilizers (ammonium sulfate, ammonium chloride, ammonia water), as well as liming of acidic soils.
Significantly reduces the amount of infection during autumn digging of the soil with the incorporation of fallen diseased leaves or their use for composting. It is advisable to grow raspberries in sparse, well-ventilated plantings, avoiding the excessive application of nitrogen fertilizers. It is not necessary to allow thickening of plantings, as it interferes with airing and lighting of bushes. But growing raspberries on a trellis improves air circulation in the area and the lightness of plantings.
To prevent the defeat of didimella, the underdeveloped and affected annual fry shoots of both ordinary and repair raspberries are completely cut and burned.
What Chemicals Can Be Used in the Fight Against Didimella?
Given that a variety of fruit, vegetables, and flower crops are usually grown on a garden plot in a limited area, it is advisable not to use chemical protective equipment. They are resorted to only if the causative agent of the disease continues to spread actively even after appropriate agricultural activities.
The development of the disease suppresses:
- processing raspberries before buds open with 7% urea solution (700 g of fertilizer per 10 l of water);
- at the beginning of bud budding and during the appearance of buds, the plants are again treated with a 0.5% urea solution (500 g of fertilizer per 10 l of water);
- during the budding period, raspberries are sprayed with 1% Bordeaux liquid;
- when young shoots reach a height of 20 cm, before flowering and after harvesting, they are treated with one of the following preparations: topaz, 10% ke, foundational, 50% sp, 1% Bordeaux liquid or cuproxate, 34, 5% ke