How to control the diseases and insect pests of Evodia rutaecarpa?

(1) soot disease. After being damaged by aphids and cotton scale, Evodia rutaecarpa trees will induce irregular black-brown coal-like spots on the injured and its lower leaves, shoots and tree trunks, and the injured area seems to be covered with a layer of coal. The seriously diseased plants have weaker tree potential and less blossom and fruit. The damage was serious from early May to mid-June.

Control methods: during the occurrence period of aphids and scale pests, 40% dimethoate 1500 × 2000 times or 25% parathion 800 × 1000 times can be sprayed once every 7 days for 2 times, and soot disease can be sprayed with 10.5 race 150 Bordeaux solution every 10 days or so for 3 times.

(2) rust. In the early stage of the disease, yellow-green, inconspicuous dots appeared on the leaves, and then there were orange-yellow small sore spots (summer spores of pathogens) on the back of the diseased leaves, which led to the death of the leaves with the increase of disease spots on the leaves. It occurred in the middle of May and the damage was serious from June to July.

Prevention and treatment: spray 0.2-0.3 Baumedu stone flow mixture or 1000-fold solution of 25% strychnine every 7 to 10 days for 3 times in a row.

(3) Brown longicorn beetle. Also known as the stem borer. The larvae enter from the tree stem and eat the xylem, forming irregular curved pores, which are full of decay chips and feces. The air discharge holes are opened at a certain distance, and the damage is serious from July to October.

Prevention and control methods: during the peak period of adults from May to July, it is feasible to kill artificially, scraping eggs and newly hatched larvae with a knife at the oviposition crack; after the larvae are eaten into the water part, there are new wormholes in the trunk. 80% of the original solution of diphtheria can be dipped with medicinal cotton into the hole or 800 times liquid perfusion, and the hole is sealed with mud, and the larvae suffocate to death; longicorn beetle swollen leg wasps can be tried to control.

(4) orange butterfly. The larvae bite the young buds and the young leaves become notches or holes, and the food intake increases greatly after the third instar, which can eat the leaves on the young branches. Reproduce 3 to 4 generations a year. It overwintered as pupa attached to branches and other attachments and began to occur in March of the following year. The adults are active during the day, and the eggs are laid on the tender leaves after mating. After hatching, the larvae feed on the tender leaves.

Control methods: low-instar larvae can be sprayed 90% and 800 times of 100 worms, once every 5-7 days, 2 times continuously, or with Bt emulsion 300 times, once every 10 days, 2 times continuously.