Sick seedling appearance identification method

In the current nursery stock market, some individual flower and wood traders often use the spurious seedlings that are commonly used to sell them as healthy seedlings. Those who lack the ability to identify diseases and diseases are easily deceived. The appearance identification methods for the seedlings and healthy seedlings of several flowers and trees are introduced as follows: kumquat The robust kumquat seedlings are graceful, branching, and densely leafed. The surface of the leaves is dark green with a bluish green color on the back of the leaves, with scattered raw glands. The diseased kumquat seedling leaves curl, white dots on the page, matt, the leaves behind the surface of the skin there are obvious curved insect tracks, or covered with brown or gray-brown dots, or the edges appear focal edge, etc. It is caused by the infestation of bacteria, and there are signs of disease. camellia The robust leaves of Camellia seedlings are thick and hard, and the leaves are dark green with a thick layer of wax and luster. The leaves are light green and flat and smooth. Diseased Camellia seedling leaves yellow, lean, sparse, or with mildew on leaf surface, or scattered brown dots on the back or branches of leaves, mostly parasitized seedlings of tea scale insects, or foliage Rye spots can be seen on the naked eye and are all caused by tea leaf spot virus infection. Jasmine Robust jasmine seedling leaves green, branches with a layer of soft hair, leaves stiff and straight. The diseased jasmine stems have water-stained brown spots, and some leaves have black granules or yellowish-white spots with curly foliage; some have white moldy leaves and the leaves are water-stained. Most of the disease caused by the disease. Five-pin pine Robust Pinus sylvestris seedlings are coniferous green, compact and beautiful, with evenly distributed shoots, vigorous and upright plants, exposed root system, no inverted roots, thick and natural trunks, and dense internodes. The diseased seedlings yellow needles, lack of leaves or with spots, pine needles slender, loose, similar to scattered hair, not many roots, with less soil. Plum blossom The robust plum branchlets are slender, green, seedling-free, and the seedlings are purple-brown with vertical stripes and well-developed root systems. The diseased plum leaves and young shoots have brown or dark brown spots. The young leaves are curled and the roots are thin. Some of the young leaves can be seen as white powdery substances. These are infected seedlings infected with the virus. Later, the illness left. Cyclamen The leaves of the robust cyclamen seedlings are thick and round. Each leaf is supported by a red petiole, which is strong and strong without falling down. Diseased flowering seedlings have petiole and leaf blade with obvious water-stained softening lesions, leaf blades shrinking, leaves soft or drooping. Severe disease even sees lodging. peony The sturdy peony stalks are stout and the leaflets are grayish green, with white frost on the back of each leaf, long petiole, and young shoots in red purple or green. The diseased peony seedlings have a purple-brown, round black spot or black fungus layer. Some rhizomes have white mycelium on the surface and the roots are black.