Anthracnose of carambola only harms the fruit of carambola, which mostly occurs at the mature stage, and the wound can induce the disease during storage and transportation. Prevention and control methods: ① Thoroughly remove. Sick little fruits buried deep in trees and rotten fruits falling on the ground. ② The damage of fruits should be minimized during harvesting and transportation. ③ Orchards with serious diseases; Spraying bordeaux solution (copper sulfate 1 kg, hydrated lime 1.2 kg, water 200 kg) or 600 times of copper oxychloride in small fruit period, and spraying 2-3 times every 10- 15 days. Clean the garden in winter. Prevention and control methods:
Red spot of carambola only harms leaves, which is a fungal disease. The damaged leaves initially produce tiny yellow spots, and then gradually expand into a circle. Semi-circular or non-plastic, dark red or purple brown in the middle, red edge, yellow circle outside the spot, finally grayish brown or grayish white in the middle, tissue necrosis, partial shedding into perforation. Control methods: ① Strengthen management, strengthen tree vigor and improve disease resistance. (2) In winter or early spring, remove diseased leaves, burn and plough the soil surface. ③ Spraying 0.5% Bordeaux solution or 600 times copper oxychloride for 7- 10 days, 1 time, ***2-3 times when new leaves are born in spring. Prevention and control methods:
Bird feather moth harms flowers and young fruits with its larvae. Because of its red color, it is also called red silk worm. It mainly eats flowers. Because the worm is small, it can only be seen by naked eyes, so it is easy to be ignored, which is very harmful, especially in June and July, when reproduction is very rapid, it can make all flowers and young fruits fall off. Control method: Spraying before flowering, 1 time, for several days, 3-5 times per flower, until the young fruit turns drooping. The pesticide can be 800 times of 90% trichlorfon, or the corresponding concentration of dichlorvos, focusing on spraying flowers and young fruits. Prevention and control methods:
Brown leaf roller moth, commonly known as heart moth, burrows into the core of fruit and eats pulp. In severe cases, the fruit damage rate is more than 40%, which leads to the fruit falling or losing its edible value. Prevention and control methods: ① Remove and bury the damaged fruits. ② Trapping and killing adults with black light. ③ Spray 800 times of 90% trichlorfon solution. Prevention and control methods:
Do a good job in clearing the garden in winter, strengthen cultivation management and enhance the ability of planting trees to resist insects; Pesticide control In warm spring and cool autumn, several pesticides are used alternately. The suitable pesticides are 73% propargite EC 2000~3000 times, 5% nisolone EC 1000~2000 times and 5% chlorfenuron 1500~2000 times. Prevention and control methods:
Usually, 90% trichlorfon is sprayed with 800 times solution. Bagging carambola fruit with thumb can effectively prevent fruit fly damage and mechanical damage, improve fruit quality and increase commodity value.