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The Plant Aide - Plant experts around you. Remove the diseased leaves and spray with zineb to prevent the spread of the disease. The specific disease of mosaic is that the leaves will have dark and light brown green spots and dry spots, and the disease branches should be eliminated in time when the disease occurs; in the early stage of the spot disease, the leaves will grow brown small spots, which can be sprayed 500 times of zincic WP. In the earlier years of cultivation the susceptibility of Lilies to diseases limited their popularity as garden plants. Another curiosity to me was the fact that the damage was not seen from stem to tip in most cases. We are fortunate enough to grow in an area where the lily beetle has yet to make an appearance, and we are extremely thankful! In the final stages the spots radiate out as streaks all over the leaf. Leaf Streak (Aureubasidium microstictum) is a fairly widespread disease that is caused by a fungus. Several species of plant lice, including the melon and lily aphid, attack lilies. Bulb rot: this disease will cause disease spots on the bulb, and finally the whole disease spot will rot. It is not restricted to affecting lilies, it affects a wide variety of other plants and crops as well, such as canola and annual bedding plants. They can be replanted in the soil in a new spot in the garden, or repotted and given away. The crinum lily is relatively resistant to pests but is susceptible to several diseases. Often it was found in the middle of the stem with no visible damage above or below that point. We have much reason to be so thankful as this dreaded little beast can do an incredible amount of damage in a very short time! The lilly pilly psyllid is a tiny sap sucking insect which attacks the young leaves of susceptible lilly pillies. Were you worried or wondering what might have caused it? You can see the pests with the naked eye on the leaves and stems of the lily, as well as for noticeable changes in appearance: lethargy, yellowing and falling off of the leaf plates, slowing growth. At the beginning of the disease, it can be irrigated. Thrips are slender, dark-colored insects, with fringed wings. A bug to strike fear in the toughest of lily growers! However, since the disease is highly contagious, the best option was to remove the plant and completely destroy it. You can use dichlorvos to irrigate the root. What is aphid, the method of Aphid Prevention and cure. Lilies are a group of flowering plants which are important in culture and literature in much of the world. Dogs don’t eat water lilies. It is with a heavy heart that I must report that the dreaded Lily Leaf Beetle is alive and confirmed to be in Alberta. In the process of Lily growth, there are many diseases that may be infected. Is the stick insect poisonous, a beneficial insect or a pest. In those cases some owners solve the problem by giving their lab its own kiddie pool. The cause of each of these harmful insects is the dry and hot air in the room. Spider mites look like a dust on the back of rose leaves - notice the white dust built up along the spine of the leaf in the photo below. These usually infest the growing tips of the plants and produce distorted leaves and a sticky secretion. The best way to avoid damage caused by pests and diseases is to ensure you have healthy, strong lily Written by Jane Reksten, Manager, Botanic Gardens and Greenhouses at Olds College, (www.oldscollege.ca) and the Alberta Regional Lily Society (www.arls-lilies.org) The old adage – prevention is the best medicine – holds true for growing lilies successfully. Nematodes penetrate root tissues, killing cells as they go. Soft rot is a bacterial disease that affects the rhizomes of calla lilies and infects the plant through injuries. When planting, choose virus-free bulbs, strengthen the control of pests, pull out the diseased plants in time and spray insecticides to remove aphids. The fungus usually enters the leaf from a wound. In serious cases, the whole leaves turn black and die. This sucking pest (Icerya seychellarum) is commonly confused with mealy bugs, but has a distinct, oval shape with white/yellow hairy surface protecting an orange body. Unfortunately, these pests – particularly the melon aphids – are vectors or disseminators of one or more virus diseases formerly known by the name mosaic and now by such names as fleck, motile, rosette and streak. We are fortunate enough to grow in an area where the lily beetle has yet to make an appearance, and we are extremely thankful. Aphids and ground tigers are the main pests, which can be sprayed and watered by dichlorvos. Disease resistant varieties of canna include Fire Dancer and Tropicana." 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