Number of bees released: When the bees were released three times, when the overwintering corn borer larvae larvae reached 20%, they pushed for 10 days, about the first time around June 22-24, and placed the bees for the first time after 5 days. Times; a third time after five days.

The number of bees released: The total number of land per acre is 15,000 heads, and the first time is 0.5 million heads per acre. The second time, 0.5 million heads per mu. The third time, 0.5 million heads per mu.

Put the number of bees: Place one point per acre.

Put the bee method:

1 torn bee card: According to the number of bees put the big bee card torn into small pieces, each parasitic egg about 80-100 bees.

2 Set the bee point: Set a bee point per acre and place the wasp card in the center of an acre. Calculated at 60 cm per ridge width, the bee-keepers counted from the side ridges of the bee field, and the 15th ridge was the first to put the bee ridge. Put the bee on the first bee-keeping point and then go forward for another 40 meters to put the second bee on the spot. In the second bee-letting point, go for another 40 meters for the third bee-dropping point. Every 40 meters is a bee, and so on. From the first ridge of the first bee ridge, the 30th ridge is the second ridge, and the placement of bees is the same as that of the first ridge. The interval between the placement of the bee ridge and the previous one was 30 ridges. And then analogy to the other side of a piece of land, if you put the bee ridge according to less than 15 ridges, then put the bee ridge as the last one, if you put the bee ridge according to more than 15 ridges and less At 30 ridges, appropriate amounts of bee were placed on appropriate ridges according to specific conditions, and specific analysis was appropriate.

3 Drop the bee: After placing the bee, pick a corn with a healthy growth, and sew the teared bee card with the sewing thread on the back of the middle part of the blade of the corn backlight, 1/3 from the base, so that the bee card parasitic eggs face downwards. (that is, the bee mouth is down).

Precautions:

1 When the farmer receives the bee card, he must release it on the morning of the same day. When it encounters light rain, it can be released. In the event of heavy rain, you cannot store the bees. You can temporarily store them, select a cool and ventilated warehouse, and place the bee cards scattered or store them in the refrigerator fresh room (0-5°C). Do not put together with pesticides.

2 When hanging cards, do not put them in the leaves of the corn or randomly on the leaves so as to avoid invalidation of the bee cards.

3 Don't use pins, pins, etc. for beekeeping cards to prevent accidental injury when the corn harvester pulls the corn harvester or feeds the animal.

4 When releasing, set the position according to the wind direction and the wind speed. If the wind is large, increase the number of points or the amount of release in the upper winds. The downwind can be reduced appropriately.

5 In the corn field where the bees were released, 4 days before the bee was released, no pesticide was allowed within 20 days after the bee was released.

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