Confused spot blight, stem withered, green withered, withered. What does it have to do with all kinds of withering?

Spot blight, leaf blight, stem blight, vine blight, standing blight, green blight, wilt. Seeing so many "blight" diseases, do you feel that your brain has been confused? Moreover, many diseases are similar to each other in terms of symptoms. For example, how to tell the difference between bacterial wilt, Fusarium wilt and vertical wilt, and between vine wilt and Fusarium wilt?

First of all, let's take a look at Fusarium wilt, bacterial wilt and Fusarium wilt.

What the three diseases have in common:

At the beginning of the disease

Will wilt during the day (noon) and recover sooner or later.

There are differences among the three diseases:

(1) the onset period is different.

Blight disease

It is a common disease in seedling stage.

Most of them occur in the middle and later stages of seedling breeding.

Bacterial wilt

The disease usually occurs at the adult stage.

Fusarium wilt

The disease usually occurs in the flowering and fruiting period.

(2) the symptoms are different.

Blight disease

Seedling withered and yellow curled

There are oval or irregular dark brown spots at the base of the stem.

Gradually wither and rot and pull up the seedlings by hand

The base of the stem is detached from the root and is easy to break.

Bacterial wilt

The main symptoms are rapid wilting and death of the plant.

The stems and leaves remain green.

. The browning part of the diseased stem is squeezed by hand.

There is milky white bacteria excreted.

Fusarium wilt

The onset is sudden, with symptoms including severe spots and wilting.

Or the death of leaves, flowers, fruits, stems or whole plants.

Blight (also known as dead seedlings)

It mainly harms the stem base or underground root of seedlings.

Seedling blight of watermelon

Root symptoms of rice blight

It is an oval or irregular dark brown spot.

In the early stage of the disease, it wilted during the day and recovered at night.

The part of the disease is gradually sunken and overflowing.

Some gradually turn dark brown.

At last it dries up and dies, rarely falling down.

The mildly diseased plants only saw brown sunken disease spots and did not die.

When the humidity of the seedbed is high

Light brown arachnoid mold can be seen in the disease department.

But not significant.

Attention should be paid to the difference between blight disease and sudden collapse disease.

They are all diseases that often occur during the seedling period.

The difference:

The disease often occurs after the seedlings are unearthed and before the true leaves are unfolded.

The floc white mold is produced and the lodging process is faster.

It mainly harms the base and stem of seedlings.

Rhizoctonia solani mostly occurs in the middle and later stages of seedling breeding.

There was no floc mildew in the disease.

The plant does not lodge in the process of disease.

Bacterial wilt and Fusarium wilt

Similarities:

All belong to vascular bundle diseases.

The vascular bundles turn brown after the attack.

Tomato bacterial wilt

Watermelon Fusarium wilt

It is characterized by whole or local wilting and wilting, and the diseased plant will wither and die in the later stage of the disease.

Differences:

(1) different pathogens

Bacterial wilt is a bacterial disease caused by Pseudomonas solanacearum.

Fusarium wilt is a fungal disease caused by Fusarium oxysporum.

(2) the symptoms are different.

Fusarium wilt usually occurs in the flowering and fruiting period.

The disease began from the lower leaves and wilted from bottom to top.

The color of the leaves gradually changed from green to light.

From yellow to withered yellow, and then to brown.

The leaves did not fall off basically, and the whole plant withered.

Longitudinal split of stem vine or stem base

And will spill yellowish-brown glue.

Brown rot of diseased root, longitudinal cutting of diseased stem

The vascular bundles at the base of the stem turned brown.

Under moist conditions

There is white or pink mildew on the surface of the disease.

Ralstonia solanacearum usually occurs at the adult stage, and the parietal lobe wilts and droops first.

Then the lower leaves wither, and finally the middle leaves wither.

There are also one side of the leaf wilting first or the whole plant wilting at the same time.

The leaves are green and withered, and generally do not wither and change color.

Ralstonia solanacearum, after cutting the diseased stem

When squeezing discolored vascular bundles with your hands

There will be a white bacterial spill.

This is its pathogenic bacteria.

After the death of Fusarium wilt, the leaves turn yellow.

No white bacteria exudate was found in the cross section after extrusion.

Vine blight

Vine blight, also known as "black rot"

It usually occurs on melons.

The symptoms of Fusarium wilt were similar to those of melon Fusarium wilt.

The biggest difference between the two

When vine blight occurs, the vascular bundles do not turn brown.

Specific symptoms:

Fusarium wilt of melon can occur from seedling stage to adult stage.

The seedlings were damaged and the cotyledons turned yellow and dull.

The cotyledons or the whole plant wilted, the stem base turned brown, constricted and collapsed.

The first manifestation of the injured strain is:

Partial leaves or leaves on one side of the plant

Wilting and drooping at noon, as if short of water

But wilted leaves recover sooner or later.

The number of wilted leaves is increasing.

Gradually spread to the whole plant, causing the whole plant to die.

The main vine constricts the glue or develops into a yellowish-brown longitudinal crack.

Browning of vascular bundles can be seen in longitudinal cutting of diseased stems.

When the humidity is high, the disease has white or pink mildew.

Melon vine blight, which mainly harms stems and leaves

Most of the disease occurs in the adult stage.

Stem vine disease

There are oval to fusiform lesions in the node.

The disease department is grayish white

There is an amber gelatinous substance overflowing.

The disease turned yellowish brown.

After drying, there are small black spots on it.

Finally, the longitudinal fissure of the disease was in the shape of hemp.

But...

Vascular bundles do not turn brown (this is the difference from Fusarium wilt)

It causes "rotten vines" when it is serious.

Leaf disease

The lesion is round or irregularly round.

Dark brown or with concentric wheels.

The lesion that occurs on the edge of the leaf is usually curved.

Born in the middle of the leaf is nearly round thin paper, light brown spots.

Let's take a look at the other three diseases.

They also carry dead words.

See what symptoms they have.

Stem blight

It mainly harms stems and fruits, as well as leaves and petioles.

The wound on the stem is easy to catch the disease.

The lesion is oval at first, brown sunken and ulcerated.

It extends up and down the stem to the whole plant.

In severe cases, the disease becomes dark brown and dry rot

And can invade the vascular bundle.

When the fruit is infected, it infects green or red fruit.

It is a small gray-white patch.

Later, the depression turned brown with the enlargement of the disease spot.

Black mold grows and causes rot.

When the disease spot of the leaf continues to expand, the leaf edge curls

Finally, the leaves dried up or the whole plant died.

Spot blight

The pathogen mainly infects leaves and also harms stems.

Such as tomato spot blight:

At the beginning of the disease, a small round spot appeared on the back of the leaf.

Chlorotic spots appeared in the rear leaves.

When the disease is serious, the leaves gradually wither and yellow.

Early senescence of the plant, resulting in early defoliation.

Leaf blight

It mainly occurs in leaves.

Leaf blight mostly occurs from leaf edge and leaf tip infection.

The disease spot is irregular from small to large, reddish brown to grayish brown.

The disease spot turns into a big withered spot, and the boundary between the disease and the disease is obvious.

In the later stage, some small black spots are produced on the disease spot.

To sum up, the causes of wilt are numerous and varied.

But as long as we understand the symptoms, the key point is to prescribe the right medicine to the case.

We try to provide plants with a relatively ventilated environment.

Secondly, according to whether it is caused by fungal infection or diseases and insect pests.

Using the right fungicides and insecticides is the key.

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