Source: agrihunt.com
Treating insects with insects and using natural enemies to control insect pests has become a very important part of agricultural and forestry biological control. Among them, the red-eyed wasp, as the most studied, widely used and longest-established natural enemy insect in the biological control of lepidoptera pests, its heroic story is very worth listening to together.
+ Hero Insect - Red-Eyed Bee +
Source: www.planetnatural.com
The red-eyed bee, belonging to the hymenoptera red-eyed bee family, is a well-known and popular presence in the hymenoptera, known to the world more than 880 species, China recorded more than 150 species.
If you pay attention to it, you will find that the red-eyed bee is often found in the field or on the sidewalk trees. However, when it appears, it is often a small paper bag or a paper card full of insect eggs.
In Changsha's Yuelu Mountain Scenic Area, staff place white paper bags containing red-eyed bee worm eggs on ancient trees
Source: news.sina.com.cn
Source: See watermark
Source: Liu Xiaoxia
After a while, thousands of adult red-eyed bees flew out.
Source: bio-group.net
The red-eyed bee is about 0.5 to 1.0 mm long, so small that it is almost invisible, and it can only be clearly seen under the microscope: there is a pair of cute red compound eyes on the head, the forewings have marginal hairs, and the cilia on the wing surface are arranged in rows, slightly trembling, looking inexplicably cute.
© John Rosenfeld
Although the length is less than 1 mm, but the combat effectiveness is bursting, because the red-eyed bee is an egg parasitic bee, the main parasitic lepidoptera insect eggs, often before the pest has time to hatch out to eat a bite of the leaf, it is destroyed by the red-eyed bee "fast and accurate" in the bud stage.
Source: alchetron.com
Usually, pests release a pheromone when they lay eggs, and mother red-eyed bees rely on the olfactory organs on their antennae to find these eggs quickly, no matter how hidden, they can not escape their detection.
Source: i5k.nal.usda.gov
To find the ideal spawning place, the mother red-eyed bee will first touch the host egg with the tentacle dots, constantly knock on the egg shell, quickly and accurately find the freshest pest eggs, and then use the egg layer at the end of the abdomen to drill into the host egg and lay the eggs in it.
The hatched larvae then feed on the yolk and pupate in it until the adults are feathered before biting through the host egg shell and going out to live freely.
Seeing this, everyone should be clear that in order to breed a large number of red-eyed bees, it is necessary to use host eggs, different red-eyed bees will have different parasitic preferences, and the most commonly used host eggs in production are tulip silkworm eggs, castor silkworm eggs and rice moth eggs.
The paper bag or card containing the eggs we mentioned earlier is one of these host eggs.
The principle has been clarified, but there are still many problems in real practice.
At present, the most widely cultivated, released and utilized species of red-eyed bees in China include: rice borer red-eyed bee Trichogramma japonicum, pine caterpillar red-eyed bee Trichogramma dendrolimi, pseudo-Australian red-eyed bee Trichogramma confusum, corn borer red-eyed bee Trichogramma ostriniae, etc.
Different crops, fruit tree species, the choice of red-eyed bee species are also different, when to release, how to release, how much to release, etc. also affect the effect of red-eyed bee control.
Pine caterpillar red-eyed bee Source: Liu Xiaoxia
We take the red-eyed bee control of pear garden pests as an example, and briefly introduce the precautions for releasing the red-eyed bee.
Knock on the blackboard, the following are the key points Oh, take the small book and write it down:
+ Pear Orchard Pest VS Red Eyed Wasp +
In the pear orchard, the main objects that can be controlled by the red-eyed bee are: pear small heartworm, peach small heartworm, peach borer borer moth, pear star caterpillar, apple permeable moth, aromatic wood beetle moth, leopard striped wood beetle moth and so on.
Early warning of insect fear
↓ ↓ ↓
First of all, we want to choose the dominant bee species, after research found that in the pear orchard, compared with the corn borer red-eyed bee and the borer yellow red-eyed bee, the pine caterpillar red-eyed bee can play a better control effect.
Pine caterpillar red-eyed bee Source: en.wikipedia.org
Secondly, the release time should also be grasped well, and it must be consistent with the egg stage of the pest to have an effect, so it is the best time to release the bees in the early stage of egg laying of the pest adult (2-3 days after the peak period of adult feathering).
PS：
To choose to release bees in the case of better meteorological conditions such as no strong wind and rainfall, it can be released on the shady side of the leaf before 10 am or after 3 pm, so as to avoid the exposure of newly feathered red-eyed bees to the sun.
And when you receive the red-eyed bee after the need to release in time, if not released in time, it should be stored at 10 ~ 15 ° C conditions, storage time can not be more than a week.
Avoid chemical pesticides for a week before and after bee release.
In addition, a sufficient number of bees is a strong guarantee to ensure the effectiveness of red-eyed bees, and the number of bees is determined by the density of the pest population.
Under the general insect population density of pear orchards, 4 bags of egg cards are released per acre, and 5,000 bees are released per bag of egg cards, that is, 20,000 bees are released per acre.
In order to ensure that the feathering stage of red-eyed wasps coincides with the high incidence of eggs, 4 bags of egg cards can be released again after 3 days of the first release of bees, each bag of egg cards is 5,000 bees, and a total of 40,000 heads/acre are released twice.
In order to improve the overall parasitic rate in the field, it is best to space each release point by more than 10m.
emmm,
The process sounds complicated,
But seriously implement it,
I believe that the results brought to you by the red-eyed bees are also surprising.
Finally, I would like to thank Liu Xiaoxia, professor of China Agricultural University and scientist of the National Pear Industry Technology System for Pest Control, for providing information and reviewing.
Read on
Farmland Friendly Army - Predatory predator insect
Who killed the pests?
Image source: Liu Xiaoxia Google source see watermark
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