One of the most common fungal diseases in rose hips is the mildew of rose Sphaerotheca pannossa.The first symptoms usually appear in mid-May or early June and initially appear on young leaves in the form of a white coating that very quickly spreads to the leaf blade.The affected leaves are deformed and their edges they slightly curl downwards.
At the end of summer, white mycelium can also be observed on the shoots and petals of flowers. High severity of symptoms may result in inhibition of flowering and leaf fall.
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Mushrooms attacking roses
Another dangerous disease is rose rust caused by several species of fungi of the genus Phragmidium. At the turn of April and May, its symptoms can be observed on the underside of the leaf and young shoots in the form of very small yellow-orange spots.Infected leaves and shoots are deformed.Leaves with symptoms of infection dry up and fall off massively. Rose lovers with the black spot of the rose Diplocarpon rosae have the most problems.
Initially, the symptoms are visible on the leaves as light brown, then blackening spots. They are round and irregular and often blend together. Around the spots, the leaf tissues turn yellow. Heavily infested leaves fall. Symptoms also appear on the shoots in the form of reddish, slightly raised discoloration. The bush, defending itself, produces new leaves before the fall, so it freezes more easily in winter.The fungus hibernates on fallen leaves and infected shoots. Resistant varieties should be grown. Plants should not be watered on cloudy and rainy days.
All rose diseases are prevented by removing infected shoots, collecting and destroying fallen leaves. Avoid wetting the leaves when watering, because the remaining moisture promotes the development of not only rust, but also other diseases.Remove fallen leaves and cut out infected shoots.Chemical protection with appropriate means should be started when we notice the first symptoms.
Most common rose pests
There are also pests on roses. One of the most dangerous is the Macrosiphum rosae aphid. In colonies, aphids feed on flower buds and apical shoots.This feeding causes plant growth to be stunted and flower buds to be deformed. After the first aphids appear, the bushes should be sprayed with insecticides in the period when the temperature drops below 20 ° C, protecting them.
Often small white spots appear on the leaves of roses. It is a feeding symptom of the Edwarsiana rosae. Larvae, nymphs and adult insects feed on the underside of the leaves.Over time, the entire leaves turn white and fall off. Adult insects are white or white-yellow.In spring the shoots need to be trimmed and burned (along with the jumper's eggs). After noticing the first damage, the plants should be sprayed with chemical preparations. Another rose pest is the Blennocampa phyllocolpa rose nut. While laying eggs, the female pricks the leaf.
As a result of the puncture, the leaves curl up and down along the main nerve. Inside, one or two larvae feed and scrape tissue from the underside of the leaf.Damaged leaves are orange, dry up and fall off.The adult insect is black and shinyThe larvae are yellowish in color and have a light brown head. After noticing the first curled leaves, collect and burn them. You can also take measures to combat aphids. With the same preparation, you can fight caterpillars that eat leaf blades.
