very weird. These plants technically grow as frost-tender perennials in U.S. Department of Agriculture plant hardiness zones 10 through 11, although most people treat them as annuals. These spots … A: It’s probably gray mold, Botrytis cinerea, a common disease of flower petals. White Spots on Petunias, Roses . It seeps through the roots and spreads through the ground part of the plant. I'd guess you have aphids. Powdery mildew is a fungus that looks like flour dusted on plants, often in circular spots. Blast them off your plants with a hard stream of water or spray ther leaves with a solution of 10% Ivory liquid & 90% water. However, these insects are hard to see and their presence may go unnoticed. Can anyone tell me what this is and how I get rid of them? Good luck with your petunias! Q: I’m seeing petunias with white spots on the flower petals. my grow in coco 2x 600 hps 6in inlet,outlet temp 27 ph 5.9 ec 1.4 Reply:I'd guess you have aphids. The disease manifests as brown spots on the branches and leaves of petunias. In general, cooler temperatures will yield more white spots and warmer temperatures will cause the petals to be more purple. You can find them in pure white, or in white paired with bright colors. The population has exploded this spring and summer, causing a lot of damage to local flowers. Petunias (Petunia x hybrida) fill many needs in the landscape, including mass plantings, borders, ground covers, hanging baskets and containers.The plants also work well in rock gardens or planted where their trumpet-shaped flowers and ovate leaves cascade over walls. Petunias are annual plants that look striking in a garden, and they will bloom all summer long with the right care. They come in many colors and bloom profusely from early summer. It most commonly appears on leaves, but can also attack stems, flowers, and fruit. Another landscape phenomenon has created a little controversy as it occurs on Mexican petunia (Ruellia species). If the white spots are not little white bugs your plants may have to much or to little fertilizer. Grows in zones 9-11. If a petunia flower is kept constantly moist, the mold will turn the bloom into a gunky mess. OK, This is NOT a disease! Diseases of petunias. They vary a lot in color, but this is an annual that is easy to grow and will complement any garden. ... Good luck with your petunias! Infected leaves can twist, break, turn yellow, and dry out. This has been a bonanza year for thrips. 0 0. Petunias are a lovely flower that is actually related to the potato. A vector of the disease is a fungus that inhabits the soil. Plants are developing white woolly patches on their leaves and stems and people are wondering if it was powdery … Plant in full sun. 1 decade ago. Blast them off your plants with a hard stream of water or spray ther leaves with a solution of 10% Ivory liquid %26amp; 90% water. ETXGardener. Needs well-drained soil. The pattern on each ‘Night Sky’ flower can change with the temperature, so many of your blooms might transform as the growing season progresses. My petunias have gotten these white specks on them. Plant petunias in beds or containers for best results. My pertunias have little white spots on the flowers - that just came up over night and look like paint splatters almost. Petunias (Petunia x hybrida) make showy additions to flowerbeds, hanging baskets and pots or containers. May be Thrips Damage . Petunias are plants that belong to the Solanaceae family, and there are over 35 different species of the plant that are all native to South America. The cause may be excess moisture in air and soil. There are no spots on the foliage. 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