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(B) Symptoms: On larch, a short section of light green patches appeared on the needles, and the lesions gradually grew yellowish green and had small swollen patches. A yellow powder pile grows on the surface of the leaf spot. Severe needles die. On the back of a poplar leaf was born a small greenish spot, and soon there was a small yellowish orange pod. After the smashing, yellow powder was scattered. Polygonal rust red patches appear on the front of the leaves in the beginning of autumn, and rust patches sometimes form into pieces. The disease usually begins with the lower leaves and gradually spreads upward.
(C) the law of development: early spring, the first year of the frog on the deciduous poplar leaves water or moisture germination, resulting in basidiospores, and spread to the larch by air currents, buds by the pore invasion. After 7-8 days of incubation, yellow rust spores are produced on the back of the leaves. Rust spores do not infest larch, and are transmitted by air currents to germinate on the leaves of the main parasitizing poplar. The stomata invade into the leaves, producing yellow-green spots on the front of the leaves 7–14 days later, and then forming a yellow summer spore heap on the back of the leaves. After the end of August, a teliospore pile formed on the leaves of poplars, and the diseased leaves landed overwintering.
(4) Prevention and control measures: 1. Do not create a mixed forest of larch and poplar; at least, do not create a mixed forest of the same age; 2. At the end of April of the nursery, spray lard seedlings with Bordeaux mixture. Poplar seedlings were sprayed with Bordeaux mixture in summer. The commonly used spray agents include: 0.3 Lithium Sulfur Mixture, 65% Moisture Sensible Zinc Liquid (500x), and Diode Sodium 200x Liquid. The prevention and treatment of this disease with 2-bromobenzidine in foreign countries has good results; 3. Prevent seedlings from growing too densely or legibly and improve resistance to disease; 4. Breeding disease-resistant tree species.
Control method for larch poplar rust
(I) Pathogens: The pathogen is Populus sphaerocarpa, which belongs to the order of rust, rust, and is a major parasite. The sexual spores and rust spores are on larch, and the summer spores and teliospores are on poplars.