Disease prevention and control methods of golden lotus

Leaf spot disease of nasturtium

Symptoms and patterns

The leaf spot pathogen overwinters in diseased remains or on the surface of the ground, and is spread by wind and rain to infect the host during the disease period the following year. Continuous cropping, overly dense planting, poor ventilation and excessive humidity are all conducive to the disease.

Prevention and treatment methods

1. Remove diseased tissues promptly and burn them in a centralized manner.

2. During daily maintenance, you should pay attention to ventilation, sterilization and disinfection, and drain stagnant water in time to prevent root rot.

3. Start spraying pesticides from the early stage of the disease to prevent the disease from spreading. Commonly used agents include 1000 times of 50% thiophanate, 500 times of 70% mancozeb, 400-600 times of 80% mancozeb, 500 times of 50% captan, etc. Pay attention to the alternating use of drugs to prevent the bacteria from developing drug resistance.

Nasturtium wilt disease

Symptoms and patterns

The vascular bundles of the affected plants are infected, and symptoms usually do not appear until the adult stage. In the early stage, the leaves appear to be dehydrated, or yellow spots, reticular discolored spots, etc. The leaves of seriously diseased plants fall off one after another, and eventually the whole plant dies. The pathogen can overwinter in soil, diseased debris or fertilizer and can survive for many years.

Prevention and treatment methods

1. Seed disinfection: Soak the seeds in 56°C warm water for 5 minutes before sowing.

2. Spraying 500 times diluted 50% thiophanate wettable powder can be used for prevention and control.

3. During daily planting, you need to pay attention to ventilation, sterilization and disinfection to avoid the growth and attachment of pathogens.

Common insect pests of nasturtium

Pests

The main ones are the cabbage looper, cabbage butterfly, whitefly, red spider, mole cricket, wireworm, etc.

Prevention and treatment methods

It is necessary to apply non-polluting pesticides such as pyridamole, cypermethrin, and diazinon in time to kill the weeds so as not to affect the growth of nasturtium.

Protect the natural enemies of various plants and use the mutual restraints between species to carry out prevention and control.