Hello, friends, and welcome to the Chunmanyuan Forum.
All winter dishes are sown from the end of July to the beginning of August.
That means it grows in autumn. That
is a major challenge August 9 Yuefen pest problems encountered.
In addition to slugs, the second pest is Pieris rapae. It is the harm
caused by slugs and this is very close. What is it? Two major hazards.
The first
lets in August after the plants have come out in two days this little vegetable shoots disappear,
causing Deficiency. Second, even if the vegetable shoots
grow late September to early October,
it may also be riddled with bite
was how to distinguish in the end it is a slug or a caterpillar.
How do you tell if it is a slug or a cabbage worm? We had to say, slug, then it will leave traces that this whitish linear
in this dish or on the ground.
You can't see it in the daytime.
Pieris do something that will stay on
the green granular bite of this dish is that it
leaves. This is the feces of the worm.
Can the bug be found during the day? Slugs are hard to find.
Pieris rapae can be found.
It just said that you must be careful. Why be careful? Its color
and the color of the dish is almost exactly the same.
What is the cabbage caterpillar?
Pieris is a vegetable we usually see inside that flying
white butterfly eggs that hatched larvae.
It is a chewing mouthpart. It is probably just out of the
egg larvae is about one millimeter.
In an age when it is mainly
second instar harm in the back of the leaves.
At this time, the appetite is small and not obvious,
and only a small mouth can be seen on the leaves. But after
the third instar, fourth instar fifth instar, it is a great appetite
can cause very significant damage overnight.
By this time it was found to
harm, when in fact it was too late.
It was
how to prevent it?
Then we must take precautions based on its characteristics.
The biggest characteristics of cabbage butterfly are three. The first
time a late discovery hazards
from one millimeter size
grows to almost 3-4 cm long.
This time to
wait for you to see the harm, in fact, the insect population is already a lot.
This is the first feature. The second characteristic is that it is particularly
strong fecundity. How strong is it to reproduce? The cabbage butterfly reproduces four to nine generations a year.
In other words, in places with cold climates, like Canada,
it breeds for about four generations a year. In a warm place
it can multiply nine generations.
How about spawning? A cabbage butterfly lays eggs, the least can produce 20, and the
most can produce 500, which is terrible.
Another Pieris belongs to the
resistance of the accumulated very quickly a species of worm. That
example, we use pesticides to spray, the surface is very effective.
But this pesticide will soon expire. For its proportion because
resistance is how development?
There are 100 Pieris we played after the drug died
ninety-nine. What about the rest of this one, it's the second year of
your offspring to use the same medicine no use for it,
you can not kill it.
What vegetables does the cabbage worm harm?
It is mainly based on cruciferous vegetables.
It especially likes cabbage and mustard greens, and
occasionally harms the young leaves of pumpkin and carrots.
So we have to focus on observation cabbage mustard
in the prevention of them. It happens that
can occur throughout the year. Of course, it won't happen in winter in Canada.
But the two most obvious time, early summer is a
five or six months, another month is August 9.
Which in September is particularly serious, and sometimes
can cause destruction of production, so that your whole seedlings missing.
What are the methods to prevent and control the cabbage caterpillar?
When it comes to prevention and control,
it is nothing more than agricultural prevention
. To eggplant peppers
among those it does not like tomato crop species.
The second physical control is
nothing more than black light, which kills adults.
In other words, cover the insect net after sowing. The third biological control.
Biological control it,
including the release parasitic wasps or spray Bacillus thuringiensis
caterpillar fungus, and so on. When biological control measures is
not feasible in our garden planted them, can not be implemented. The fourth is chemical control.
In the United States or China are effective pesticides, but
can not buy in Canada, nor can. What's the reason?
Its accumulation of drug resistance is very serious. After you substitute a single
generation is not necessarily useful.
Besides, we can't buy it in Canada.
So I don't really advocate using this method.
If you go online to check this information
from the media have a lot to do this
zoom trick. The so-called use of plant ash to make this cabbage worm go extinct.
Can it be done? Can't do it.
why. We just said that the
earliest first instar, second and third instar of Pieris rapae is on the back of the leaf.
You sprinkle ash, ash is difficult to
spread to the underside of leaves, this is the first.
Second,
you sprinkle of rain or watering ash has been washed away. But its eggs or bugs are on the back of the leaf.
You can not go a day or Caesar
is going back to Caesar.
The second method of online transmission is to control insects. what is that.
Crush the caught cabbage worm, mix it with water and spray it on to
avoid the cabbage worm.
This is not realistic. why? So you can catch mashed cabbage worm can
when it is actually on your dish has become
a hazard. That's for nothing.
The third is to use lime, lime aqueous solution of one percent to three,
or detergent solution, or an aqueous solution to
pepper spray. Does it work? has an effect.
But then again, you can not say that
Gesanchawu went to spray these things.
These methods do not pay attention to prevention, and the prevention and control effects are limited.
My method is five o'clock. The first point is rural cleanliness.
Since its pupa sticks to the old leaves,
it will be passed down in the soil afterwards and used as the source of transmission.
Then we remember that before or
after harvesting vegetables farming, sure to
clean up the surface of the ground. Any weeds.
Dig a pit in a corner, cleaning up after it
buried, buried in the pit. How deep is it? Below 30 cm.
If this time there is any residual pupae on the
leaves, then after laying it to get out, we eliminated the source of infection.
So this job is very important.
The second cruciferous vegetables and tomatoes peppers eggplant Solanaceae these
vegetables, cabbage, kale ah ah ah interval with mustard
seed. It is not to put all cruciferous vegetables
in an even, you separate species. Say,
a cabbage, an eggplant a tomato, this species diverge,
it can play a role in aversion to cabbage
butterfly, Pieris can significantly reduce infection.
The third
nursery, it is best to take nursery pots.
why? The area of ​​flowerpots for raising seedlings is small, so we can easily control it.
With a small insect nets
to cover, to be avoided
cabbage butterfly eggs on vegetable shoots.
After that fourth point is that we kind of go
cruciferous vegetables
must remember to timely insect nets to cover,
and must be tightly closed. I recommend this method
because later this year, many of my friends do what I do,
but still some people still have Pieris,
it happened. How did it happen?
I also found that when the insect screen was placed in one corner,
that corner was just not compacted and was blown up by the wind.
Sure enough, a week later
leaf vegetables missing, a look, there is this caterpillar.
So when we cover the key is to Gaiyan
insect nets. Another point
I once saw a Youtube video,
it was said with bird netting can prevent Pieris.
In fact, this is wrong. Because the hole of this bird netting is very large.
The width of this hole is about one centimeter, and it cannot prevent the cabbage butterfly.
The last point is the end of August to August,
early September, especially in early September, when
this dish every day to be observed. First observe the cabbage mustard vegetables to
see if there are any leaf defects.
If there are defects in leaves, especially with the above
green insect feces when, in time to go.
Not hard to find. For example, if it is a slug hazard,
there is no worm excrement on it. You should look for
it at night. If it is a slug, look for one.
If Pieris, there worm feces on it, you can not find at night, during the day
you look closely, it must be in that place
worm feces and leaves gaps, do not exceed 5 cm away. Usually in the middle of the veins.
If you catch one, you can often catch seven, eight, and ten. Following these methods,
I controlled the Pieris rapae.
Only today is there a full harvest without pests.
I hope we can do that
too, after the winter still has its own kind of food
to eat. Thank you for watching, and wish you a happy and healthy plant.