Prevention and control of diseases and insect pests of Begonia subsescens
Begonia cling-stem is popular among horticulture enthusiasts for its blooming ornamental value, but pest and disease problems often hinder plant growth. According to survey data, more than 68% of the blight cases of crabapple sticking are related to improper control measures. This paper will systematically analyze the characteristics of three major types of common pests and diseases and provide scientific control plans. Identification map of Pest and Pests of Malus subsescens Fungus Diseases: Comprehensive analysis of rust Rust is the primary disease threatening Malus subsescens. Its mycelium can survive through the winter in branches for up to 9 months. Typical symptoms are orange powdery spore piles on the back of the leaves and yellow spots on the corresponding positions on the front. Without timely intervention, the high temperature season from July to August can cause more than 50% of leaves to fall off. Double threat from pests: The adult pear crown bug and peach aphid pear crown bug are 3-4mm long and form dense white spots by piercing and sucking leaf juice. During the outbreak period from June to September, 30% of the photosynthetic area can be lost. Peach aphids prefer to gather tender buds, and the honey dew they secrete can induce coal pollution disease and reduce the ornamental value of the plant by 40%. Four elements of ecological prevention and control of the comprehensive control system of Begonia clingensis 1. Space management: Keep plant spacing ≥80cm and ensure air circulation 2. Nutrient regulation: Apply N-P-K=5-10-10 compound fertilizer in spring and autumn to enhance resistance 3. Hygiene and cleaning: Clean up fallen leaves and sick branches every week to block the chain of pathogen transmission 4. Biological control: Release ladybugs (3-5 per plant) to control aphid population Precise medication plan for rust control: spray 3°Be sulfur mixture before germination in early spring, and alternately use 25% triadimefone wettable powder (1:800) and 80% Mancozeb (1:1000) during the growth period, apply fertilizer at an interval of 10 days for pest control: Imidacloprid (10% content) is 2000 times to control peach aphids, and bifenthrin (2.5% microemulsion) is 1500 times to deal with pear crown bug. It is recommended to spray it in the morning to improve the efficacy by establishing a protection system of "prevention first, comprehensive management"., can reduce the incidence of pests and diseases in Begonia clingensis by 75%. Regularly observe the status of the plants, carry out three systematic prevention and control during the spring germination period, the summer flowering period, and the autumn defoliation period, and cooperate with scientific fertilizer and water management to ensure healthy growth of the plants throughout the year. It is recommended to establish a control log to record the time and effect of each application to provide data support for long-term maintenance.