Herbaceous plant Gentiana leaf rust, root rot, aphids and other major diseases and insect pests and control measures?

Gentiana macrophylla, alias Gentiana macrophylla, perennial herb, is one of the main drugs for the treatment of rheumatic arthralgia, tuberculosis, hot flashes, jaundice and so on. That herbaceous plant Gentiana leaf rust, root rot, aphids and other major diseases and insect pests and control measures? Let's learn more about it.

1. Main diseases and control measures of Gentiana macrophylla

1. Leaf rust: the disease is easy to be induced by high temperature and humidity in the field, which mainly infects the leaves. There are yellow spots on the front of the leaves in the early stage, and the disease spots spread and fuse in the later stage. Yellow protuberant spot on the back, that is, spore pile. When the disease is serious, the leaves wither and yellow and die.

Prevention and control measures: thoroughly remove the sick and residual bodies in the field after autumn and burn them centrally. Sporadic disease choose 25% trimethoprim 200 times liquid, trimethoprazole 800 times solution, 50% ether fat 800 times liquid and other agents, alternate spraying.

2. Virus disease: the disease was mainly transmitted by thrips, and the leaves appeared faded green-yellow-green spots at the initial stage of the disease, and became more and more serious with the disease. In the later stage, the disease spot enlarged and increased, showing that the leaves were covered with yellow-green round classes, and finally the whole leaves turned yellow until the plant died.

Control measures: strengthen field management and clean up the residual plants in the field in time after harvest in order to eliminate the initial infection source of the virus. The withered branches, fallen leaves and weeds in the field were thoroughly removed and burned before early spring to eliminate overwintering eggs. At the initial stage of the disease, 20% virus A, 1.5% Zhiyanling, 20% morpholine guanidine hydrochloride wettable powder, 7.5% Shiduqing and other agents were sprayed, while potassium dihydrogen phosphate foliar fertilizer was sprayed.

3. Root rot: plant root injury, continuous cropping and stagnant water in the field are prone to this disease. It mainly harms the roots, which gradually turn black after infection, rot in the later stage, turn yellow in the lower foot leaves of the plant, and wither and die in severe cases.

Prevention and control measures: rotation, timely drainage after rain, application of rotten farm manure. At the initial stage of the disease, 70% methyl topiramate 600-fold solution, 75% chlorothalonil 600-fold solution, 50% chlorobromoisomiuric acid 800-fold solution were selected for rotational root irrigation.

II. Main insect pests and control measures of Gentiana macrophylla

Insect pests are mainly aphids and thrips.

Flowering is the most harmful. When it occurs, natural enemies such as ladybugs and aphid flies can be used for biological control, or yellow rebounds can be trapped, or 10% imidacloprid and 5% acetamiprid can be sprayed to control underground pests.