What should I do if all the bougainvillea leaves fall off?
If you want to know the topic of flowers and plants when all bougainvillea leaves fall out, the next step is a comprehensive introduction.
Bougainvillea (scientific name: Bougainvillea) is widely loved for its gorgeous color and strong adaptability, but if the leaves fall off, it often catches growers unprepared. This article will systematically analyze the reasons from three dimensions: environmental factors, maintenance and management, and pest control, and provide actionable treatment plans to help your plants recover.
- -1. Falling leaves caused by environmental factors and their treatment--1. - - Sudden changes in temperature cause stress-Bougainvillea is native to the tropics, and the suitable growth temperature is 15-30℃. When the winter temperature is lower than 5℃, the leaves will turn black and fall off due to cold damage. It is necessary to immediately move the potted plants indoors to the sun, and cover the plants with plastic film at night to keep them warm. If you have frostbite, suspend watering after pruning dead branches, and apply diluted phosphorus and potassium fertilizers (such as potassium dihydrogen phosphate 1:1000) to promote new shoots after spring temperatures rise. 2. - - Typical manifestation of insufficient light-more than 6 hours of direct light per day is required. Long-term shading will cause yellowing and shedding of leaves. The solution is operated in stages: first move to the scattered light to adapt for 1 week, and then gradually increase the light intensity. In northern winter, you can use fill light (full-spectrum LED, fill light for 4 hours a day) to prevent falling leaves. Red new buds can be observed germinating in the leaf axils after one week. 3. - - Control skills of air humidity-When the air humidity falls below 40% in the dry season, it is easy to cause fallen leaves. It is recommended to use the combination of "dipping basin method + spraying": immerse the flower pot in water for 10 minutes every week (the water level does not exceed 2/3 of the height of the pot), and use a sprayer to spray water on the surrounding air to increase humidity before 10:00 every day. Be careful to avoid water droplets remaining on the leaves and causing burns. - -2. Remedial measures for improper water and nutrition management--1. - - First aid treatment of stagnant water-If your finger is inserted into the basin soil for 2 centimeters and it is still moist, it is stagnant water. Remove the pot immediately to check the root system, cut off the black and rotten roots (keep light yellow healthy roots), soak them in 800 times carbendazim solution for 30 minutes, and then replace them with new soil (peat soil: perlite =3:1). In the later stage of restoration, watering follows the principle of "seeing dry, seeing wet". It is watered thoroughly once every 3 days in summer and extended to 7-10 days in winter. 2. - - Degradation method of fertilizer damage-scorched leaf margins accompanied by falling leaves are typical symptoms of fertilizer damage. First use clear water to irrigate the roots three times continuously (each time at an interval of 1 hour) to dilute the fertilizer, and then suspend fertilization for 2 weeks. It is recommended to switch to slow-release fertilizers (such as Aolu 318s, 20 grains per pot), and the duration of the fertilizer effect is synchronized with the watering frequency. After the new leaves are unfolded, 0.1% urea solution can be sprayed on the leaves every week. 3. - - Accurate identification of vitamin deficiency-Uniform yellowing and shedding of old leaves indicates nitrogen deficiency, and yellowing between veins indicates iron deficiency. It should be supplemented promptly after diagnosis: use decomposed soybean cake water (diluted 1:50) for nitrogen deficiency, and spray iron chelate (0.05% concentration) for iron deficiency. It is recommended to pre-bury organic fertilizer (200g of sheep manure/pot) as base fertilizer every quarter to reduce the occurrence of nutrient deficiency. - -3. Comprehensive pest management plan- -1. - - Biological control of red spiders-White spots appear on the back of leaves and accompanying spider webs, which means that red spiders are invaded. At the beginning, pepper water (50g of dried pepper is boiled and cooled and then filtered) can be sprayed on the back of the leaves. In severe cases, biphenylhydrazate suspending concentrate (240g/L, diluted 3000 times) can be sprayed every other week. Coupled with the release of predatory mites (Phytoseius microchilus, 50 per square meter) can establish long-term prevention and control. 2. - - Soil treatment of root-knot nematodes-Plant growth is stagnant and root systems are bulged. When soil replacement is needed, 5% avermectin granules (1g/kg soil) are mixed. It is recommended to use Paecilomyces lilacinus (1 billion CFU/g) to irrigate roots once in spring and autumn every year, and the preventive effect reaches more than 85%. Ground planted plants can be planted around marigolds to repel nematodes. 3. - - Blocking strategy for (T-J) disease-When brown and round disease spots appear on the leaves, immediately remove the sick leaves and spray 1500 times 25% prochloraz EC. The key prevention period is before the plum rainy season. Garlicin water-soluble preparation (5% content) can be sprayed once a month, which can not only prevent disease but also enhance the waxy layer of leaves. - -4. Pruning to promote buds and management during the recovery period-Deciduous plants should be re-trimmed in spring, retaining 15-20cm of the main stem, and the cutting tip is 1cm away from the bud point at a 45° angle. After applying the healing agent to the wound, a black plastic bag was used to cover the plant (poke several small holes) to create a high-humidity environment. After about 20 days, the germination rate of new buds reached more than 90%. During this period, spraying seaweed extract (0.01%) every 10 days can accelerate recovery. During the recovery period, do not rush to promote flowers, and cultivate strong leaf bushes first. After 6 pairs of leaves have grown in the new branches, pick the branches to promote branching, and at the same time, add high potassium fertilizer (Ruhua Duoduo 12). Under normal maintenance, flowers can bloom again after 3-4 months. Special reminder: Water control during the flowering period needs to be gradual. Sudden water cuts may lead to secondary fallen leaves. - - Reference to case measured data- -A 2022 control experiment at Zhangzhou Nursery in Fujian Province showed that after systematic treatment of deciduous plants, the recovery rate of the "heat preservation + light supplement + seaweed essence" program was 91.2%, which was 37% higher than that of conventional treatment. The treatment group germinated for an average of 23 days, restored 80% of the crown width after 54 days, and the number of flowering reached 76% of healthy plants the following year.
The above is what to do if all Bougainvillea leaves fall off? A comprehensive method to explain, hope that a throw a brick to attract jade can solve your problems in green plants bar.