Search results
Results from the WOW.Com Content Network
The blight spreads through an infected tree, invading and colonizing the plant's roots, leaves, and trunk. As of 2020, neither the causal agent nor the spreading mechanism of the disease is known. [2] Research by the Citrus Research and Development Foundation posits the blight is caused by an endogenous plant pararetrovirus (EPRV). [3]
Insects packed with harvested fruits continue to feed, causing more losses during shipping. The mealybug secretes honeydew , which coats leaves and fruits and causes the growth of sooty molds . A layer of mold can reduce the ability of a leaf to perform photosynthesis , and makes fruit unmarketable. [ 1 ]
The best time to prune a lemon tree is right after all the fruit has been harvested, which can vary depending on your USDA zone. However, it typically happens in later winter or early spring.
The most serious pests are mealybugs that feed on citrus. Other species damage sugarcane, grapes, pineapple (Jahn et al. 2003), coffee trees, cassava, ferns, cacti, gardenias, papaya, mulberry, sunflower and orchids. Mealybugs only tend to be serious pests in the presence of ants because the ants protect them from predators and parasites. [2]
Leaves show a characteristic curling, similar to damage caused by viruses. Heavily infested plants have shortened internodes leading to resetting or a "bunchy top" appearance. A heavy, black, sooty mold may develop on an infested plant's leaves and stems as a result of the mealybug's heavy honey-dew secretions.
Fungal diseases; Albinism Alternaria alternata = Alternaria tenuis Aspergillus flavus. Alternaria brown spot Alternaria alternata: Alternaria leaf spot of rough lemon Alternaria citri: Alternaria stem-end rot Alternaria citri: Anthracnose = wither-tip Glomerella cingulata Colletotrichum gloeosporioides [anamorph] Areolate leaf spot ...
A number of types of citrus canker diseases are caused by different pathovars and variants of the bacterium: [4] The Asiatic type of canker (canker A), X. axonopodis pv. citri, caused by a group of strains originally found in Asia, is the most widespread and severe form of the disease. Cancrosis B, caused by a group of X. axonopodis pv.
Sooty mold is commonly seen on the leaves of ornamental plants such as azaleas, gardenias, camellias, crepe myrtles, Mangifera and laurels. Karuka is affected by sooty mold caused by Meliola juttingii. [6] Plants located under pecan or hickory trees are particularly susceptible to sooty mold, because honeydew-secreting insects often inhabit ...