Control methods of hyacinth root rot

Hyacinth cultivation areas occur from time to time, endangering hyacinth and other flowers, resulting in root rot.

Symptom

After the plant is damaged, the growth is weak, dwarf, can not blossom normally, dig up the soil, it can be seen that most or all of the roots on the corm rot. The pathogen of the disease is Fusarium, which belongs to fungi. The pathogen overwintered in the remnants of diseased plants and spread through Rain Water, irrigation water, field horticulture and so on.

Prevention and cure method

(1) strengthen cultivation management. Hyacinth likes to be cool and cold-resistant, and should be moist and sunny. Like fertilizer, requires rich in humus, well-drained sandy loam. The roots sprouted in autumn, the leaves bloomed in early spring, the stems and leaves were withered and yellow in midsummer, and the bulbs dormant and differentiated flower buds. Separate bulbs breed in autumn. North China chooses to plant in a sunny and sheltered environment, which can survive the winter with a little cover in winter. Apply sufficient base fertilizer before planting, topdressing before flowering, control fertilizer and water in the later stage, and store the ball in a dry, cool and ventilated place after summer dormancy.

(2) instead of planting diseased bulbs, the pot soil of diseased plants should be replaced and planted with disease-free soil, or dimethazone can be used to disinfect the soil.

(3) soak the seeds with 800 times solution of 50% benzoate wettable powder for disinfection.

How to control the soft rot of hyacinth

In the greenhouse, the seriously infected bulb no longer germinates, the bulb becomes soft, and the tissue of the bulb is transparent with white or yellow spots. These infected bulbs also give off an unpleasant smell. The symptom of mild infection is the formation of wet, dark green strips from the base of the leaves, first hindering growth, then wilting until the plant dies.

1. Etiology

The disease is caused by Erwinia. Most of these bacteria are parasitic and mainly infect tissues that are frozen or overhydrated. Another form of infection is infection from wounds where precocious roots or bulbs peel off when the temperature is too high or the soil is too wet. This problem is mainly caused by too high or too wet soil temperature during natural cold treatment in autumn.

The manifestation of soft rot: the top of the bulb showed waterlogged slippery soft rot, the base of the pedicel rotted, the flower did not bloom, the flower bud fell off first, or the abnormal flower was formed in the later stage. After being infected, the buds first turn white, and then they become sticky, soft and smelly. The leaves also produce watery rot, but the disease is not contagious in the greenhouse, and although the infected tissue is usually buttered, the infection does not occur in other parts.

2. Prevention and control methods

(1) bulbs are usually planted under the recommended conditions, that is, natural treatment or low temperature (9 ℃) in the rooting chamber, while not too wet.

(2) the infected bulbs and plants should be removed during planting and throughout the greenhouse period, which can prevent Erwinia from spreading to neighboring bulbs through irrigation water.

Prevention and control of bacterial soft rot of Iris bacterial soft rot is one of the most common diseases of Iris, whether it is bulbous Iris or rhizomatous Iris. The following combined with years of breeding experience, to talk about the prevention and control of Iris soft rot.

The pathogen of Iris soft rot is bacteria. At present, there are two known species, namely, carrot soft rot Erwinia carrot pathogenic variety of carrot and Amorphophallus Owens, both of which belong to Bacteriacea and Owens. In addition to irises, it also harms many kinds of flowers and plants, such as cyclamen, hyacinth, lilies and tulips. The law of the disease is that germs generally survive the winter in the soil and stubble. They can survive in the soil for several months, and if they are in the remains of diseased plants, they can survive for a long time. It is easier to survive when the temperature and humidity are high. Therefore, in general, the disease occurs more when the soil is moist, where the planting is too dense and the shade coverage is large. If the disease has already occurred, the method that should be taken immediately is to choose the mixture of streptomycin or streptomycin plus oxytetracycline (10:1) to spray the plant and the ground for 2-3 times with good results. After the disease, agricultural streptomycin can also be sprayed once a month, so that the spread of the disease can be controlled in parallel.