Powdery mildew
One of the most common fungal diseases found in rose hips is the mildew of rose Sphaerotheca pannossa. The first symptoms appear in mid-May or early June and initially appear on young leaves as a white coating that quickly spreads to the leaf blade. Infected leaves are deformed and their edges curl slightly downwards. At the end of summer, white mycelium can also be observed on the shoots and on the flower petals. High severity of symptoms may cause inhibition of flowering and leaf fall. The fungus does not need water to develop, so the disease occurs both in wet weather and in dry summers.The most important prevention is the cultivation of resistant varieties. Infested leaves should be raided and burned. With severe symptoms, it is necessary to cut out the affected shoots.
Gray mold
Another common rose disease is Botrytis cinerea gray mold, which thrives best on roses that grow under unfavorable soil or weather conditions. The symptoms of gray mold are visible on the above-ground plant organs. Dark watery spots appear on the surface of the outer petals of the crown, which grow rapidly. Tissues turn brown and die on infected shoots. The further development of the disease may lead to the death of the entire plant. This fungus grows in a wide temperature range and with high air humidity. Diseased plants should be cut and burned. Sprinkling the plants in the evening should also be avoided, as wet plants provide ideal conditions for the development of the fungus. After finding the symptoms, spray the plants with plant protection products.
Black spot
Black spot of rose Diplocarpon rosae is the most problematic for rose growers.Initially, spots are visible on the leaves, at first light brown, with time turning black. The spots are round and irregular. The leaf tissues around the spots turn yellow due to the secretion of chemicals by the fungus. Heavily infested leaves fall. The symptoms also appear on the shoots as reddish, slightly raised discoloration. The fungus hibernates on fallen leaves and infected shoots. Resistant varieties should be grown. Plants should not be watered on cloudy and rainy days. Fallen leaves must be removed and infested shoots cut. Chemical protection should begin in June.
Aphids and leafhoppers
Various species of aphids are a dangerous pest of roses. Among them, one of the most harmful is the rose-bristle aphid. In addition to aphids, small white spots can often be observed 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, all leaves turn white and fall off.Adult insects are white or white-yellow. They hibernate on the shoots. The first generation occurs in May and the second in August. In spring it is necessary to trim the shoots and burn them along with the eggs. After noticing the first damage, the plants should be sprayed with chemical preparations.
NimułkaAnother rose pest is the Blennocampa phyllocolpa rose nettle. While laying eggs, the female pricks the leaf. As a result of the puncture, the leaves curl upside down along the main vein. Inside, one or two larvae feed and scrape tissue from the underside of the leaf. Damaged leaves are orange in color, dry up and fall off. The adult insect is black, shiny. The larvae are yellowish and have a light brown head. Females lay eggs from mid-June. After 4-6 days from laying eggs, the larvae begin to feed. The larvae descend into the soil for pupation (last at the end of June) and hibernate until the following year. After noticing the first curled leaves, collect and burn them.
