What common diseases should be prevented in roses in winter?

The rainy season is coming, and some flower friends are happy: God is watering for me.

Really too naive and too simple! What about the black spot that is called the number one disease in summer? A few spots grow gently, and the leaves become bald...

Many flower friends do not like spraying chemicals, but if black spot is not sprayed, letting it grow will directly affect the flowering amount in autumn and next spring. So listen to me about the rainy season, but we need to spray chemicals! !

- Revealing the true face of black spot -

There is black spot on the leaves.

When flower seedlings are just infected with black spot, brown spots appear on the leaf surface, then spread radially into dark brown spots.

Black spot often occurs in the summer plum rain season, with high temperature and high humidity. The main cause is mold: spores on the lesions are contagious by splashing and splashing onto surrounding leaves.

Catalyzed by high summer temperatures, when rainwater remains on the leaves for more than 4 hours, the spores of black spot begin to germinate.

In addition to the plum rain, dense branches, large amounts of water sprayed on the leaf surface, and spreading mist also make black spot develop quickly, and the condition is more severe.

We have a test field where chemicals are never sprayed.

And then it became like this...

- Black spot: prevention is major -

Black spot is mainly based on prevention.

Although it is very harmful, fortunately, as long as prevention is timely, it can basically prevent the occurrence of the disease (marked!!).

Prevention:

? Frequently clean the leaves.

Do not leave water droplets on the leaves for too long.

Observe the flower seedlings every day, and if lesions are found, deal with them immediately.

Seedlings should not be planted/placed too densely, and basal branches should be pruned regularly to ensure ventilation.

? Spray prevention: spray once every 4 days to prevent it; after continuous rain for >4 hours, spray again.

Medication recommendations:

Use Difenoconazole, difenoconazole, Nustar (flusilazole)

- Small treatment methods -

At any time, taking measures to make up for it rather than being indifferent is always better. So, if your rose has already fallen to black spot, do this.

You have a chance to save it!

Treatment:

When black spot is found, remove the diseased leaves (do not pick it when there are few leaves).

? Spray: same as above. (I am too lazy to turn it over and show you: spray once every 4 days; if continuous rain lasts >4 hours, immediately spray another chemical.)

Medication recommendations:

Use Difenoconazole, difenoconazole, Nustar (flusilazole), Tebuconazole, Amistar, Score, Luna Sensation, Luna Reload

*Note: During the rainy season, the rain will not stop. Many people mistakenly think there is no chance to spray. But in fact, there is no rain from morning to night. When the rain stops for a short while, it will be sprayed. Even if it is sprayed, it will have an effect. If you do not spray because of rain and more rain, it will cause the spread of black spot. After an outbreak, remedial measures are too late.

*Note?: Powdery mildew and black spot are treated with the same medication.

END

The rose was not managed well and has already gotten black spot. Rose black spot is a very serious fungal disease with rapid spread and high damage. If you have a month of treatment, if it is not treated well, it is easy to break out. Today I bring you novice rose care - rose black spot!

Rose black spot is a worldwide disease that occurs in the country, mainly caused on leaves, followed by petioles, leaf tips, young branches and pedicels. In the south and north, the incidence of the disease is higher. This disease causes leaves to turn yellow and fall. When the disease is severe in summer and midsummer and late summer and September, the leaves will all fall, ruining the autumn flowering of roses and heavily weakening the tree.

Transmission route: spread with rainwater or sprinkling water, and insects also spread it. The optimal starting temperature is about 26°C. In the rainy season, host plants are severely affected; newly transplanted plants and plants with damaged roots are prone to the disease.

How to prevent it?

This disease is very likely to appear in rainy weather, sudden high temperatures, high humidity and poor air permeability. Second, the soil is poor or there are such diseased objects around. Spraying carbendazim or mancozeb in rainy weather can prevent it. At such a severe stage, professional fungicides should be used: difenoconazole, flusilazole, etc. Leaves can be pruned, and the leaves of the pot need to be cleaned. Use scissors, and they need to be disinfected after use.

Also be careful to bag and burn leaves. After applying fungicide, good fermented fertilizer must be started within 7 days and conditioning and sprouting must begin. This is mainly to reduce losses. Because black spot occurs in the season, most leaves cannot be used, and some branches need pruning. For roses, this is a very major operation. At this time, we need to quickly restore them this season.

Many people only pay attention to treatment and often neglect later recovery. This causes the rose, over a long period, to grow slowly, affecting flowering for a whole year. Therefore, when you treat black spot, you should always add nutrients to the rose leaves and increase humidity by the way. After high temperatures, the rose needs a certain amount of humidity to sprout; accordingly, generally after 15 days in the season, it begins to sprout a lot.

After sprouting, spray mancozeb once a month. This can play a protective role and prevent the rose from getting black spot. This is very important! Entering the June station season is dangerous, everyone should remain cautious.