How to prevent hollow stem (rotten heart) in greenhouse broccoli?

The main conditions for hollow stem (rotten heart) in greenhouse broccoli are: planting bacteria-carrying seeds leads to more chances of disease onset and a higher incidence rate. High soil temperatures inside the greenhouse also cause severe disease outbreaks. The main preventive measures are:

1. Seed dressing with chemicals: Before sowing, dress the seeds with New High Lipid Film, which can keep warm, retain moisture, and promote swelling, improve the seed germination rate, and make the seedlings robust. It repels underground pests and isolates viral infection. It can also be mixed with seed coating agents.

2. Chemical control: In the early stage of the disease, remove diseased seedlings and promptly spray with a medicinal solution for control. When choosing chemicals, you must use targeted chemicals together with New High Lipid Film, which can convert highly toxic pesticides into moderately toxic ones, moderately toxic pesticides into low-toxicity ones, and low-toxicity pesticides into minimally toxic ones. It controls pesticide evaporation and drift, prevents light rain from washing it off, reduces the dosage per mu (by half), and improves the control effect (several times over).

3. Pull out diseased seedlings: For necrotic diseased seedlings caused by hollow stem (rotten heart), pull them out promptly and dispose of them outside the greenhouse. After pulling them out, promptly spray New High Lipid Film to form a polymer film, so as to prevent the disease from continuing to spread and causing a reduction in yield.