Timely Controlling Shed Strawberry Red Spider
Before mid-October of this year, the rainy weather in the south region lasted for more than a month. Since late March, the weather has improved and the temperature has risen rapidly. Within the plastic greenhouses covered by plastic film cultivation, some strawberries have begun to have red due to the effects of warming. Infested by spiders, some areas breed quickly. The red spider that injures the strawberry is mainly the two-pointed red spider, followed by the cyclamen spider mite. Their hosts are very extensive. They include soybeans, cotton, corn, eggplants, watermelons, and a variety of weeds. If the crops are planted adjacent to each other, they can often be transferred to each other and can occur in more than 10 generations a year.
Judging from the field inspection situation, Starsaw mostly concentrated on the back of the strawberry and sucked juice. The victim part was initially spotted with white spots and then turned red. In severe cases, the leaves showed a contiguous rust-like color that resembled a fire. Expansion will inevitably reduce the yield and quality of strawberries. Under the high temperature conditions in the shed, if it is neglected, it may cause great losses.
The origins of these red spiders are: the remnants of strawberry in the reclaimed fields; the remnants of the former remnants of the vegetables; the third, the incomplete remediation of the insects on the strawberry seed beds; the introduction of insects into the greenhouses; and the host of the red spiders. In the management, the human body carries insects inside, or carries the tools with insects, or spreads them with the help of wind. Once the weather is suitable, they are bred in situ.
In order to prevent and reduce the damage caused by red spiders to wintering strawberries in greenhouses, the following control measures should be taken.
First of all, we must improve the ecological environment. Red spider likes hot, dry conditions. The higher the temperature, the lower the humidity and the faster it will happen. Therefore, in terms of water management, under the premise of keeping the soil moist, when the temperature is too high, it should be appropriate to cool the air, so that it can inhibit the rapid propagation of red spiders.
Second, we must remove old leaves in time to remove the source of insects. For strawberries that have been infested with red spiders, the old leaves of the base and some of the infected old leaves must be removed at any time and taken out of the shed to be completely destroyed.
Third, spray pesticides in sections to prevent the development of resistance. The first is to spray 1.8% of avermectin EC 5000 times, or 5% 5% Nicorso EC 1500 times, or 73% ECG EC 2000 to 3000 times; second is to spray low residue before picking strawberries. The 20% synergistic phytonthrin 500 to 800 times, or 1.8% efiting EC 1500 to 2000 times; the third is 25% killing Qianlong EC after 1000~2000 times, or 45% Crystal lime sulfur. The above medicines should be used alternately to prevent the spider mites from developing drug resistance. Http://
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