Locusts are the main pests on cucumbers in greenhouses. The conventional spray control method often increases the humidity in the greenhouse and may induce or aggravate the occurrence of diseases. Nitenpyram has a higher control effect on aphids and has a strong systemic effect. In this regard, we used 50% nitenpyram-soluble granules for root irritation experiments to study its control effect on greenhouse cucumber aphids.
In the experiment, 10 agents were used to treat 50% nitenpyram-soluble granules in 0.1 g, 0.12 g, 0.14 g, 0.16 g, 0.18 g, 0.2 g, 0.22 g, 0.24 g, 0.26 g, 0.28 per plant, respectively. Grams, all formulated as 2000 times liquid irrigated. Investigate the amount of insects 1 day, 3 days, and 10 days after the drug and calculate the reduction rate of insect population.
The experimental data show that under the application rate of 0.1-0.28 g per plant, 50% nitenpyram-soluble granules for root irrigation have better control effect on cucumber aphids in greenhouses, and the rate of insect population decline at 1 day after the drug is Over 52%, with the increase of time, the control effect was gradually increased. The rate of insect population decline after 10 days was more than 96%, which was significantly higher than the rate of insect population decline after 3 days. After further analysis, it was found that there was no significant difference in the reduction rate of insect population between treatments with a drug dose higher than 0.18 g per day after the drug was administered. In practical use, the amount of 50% nitenpyram-soluble granules should be controlled below 0.18 g per plant.
The experiment also found that nitenpyrine rooting had a good effect on aphids, and the population density of the aphids on some plants was still low at 20 days after the treatment of each agent, and the treatment coal contamination without drug use was serious. Safety surveys showed that 50% nitenpyramin-soluble granules were safe for cucumber plants within the above-mentioned experimental dose range.
The results showed that 50% nitenpyram-soluble granules had better control effect on cucumber aphids in greenhouses. Compared with spraying, irrigation roots could effectively control the humidity in the shed and reduce the risk of disease occurrence. The Irrigation Method can be applied in combination with field irrigation, where it can be administered through a sub-membrane irrigation system to further control the humidity in the shelter. It should be noted that the method of irrigating the roots is to apply the liquid to the soil, absorb it through the roots of the crop, and transfer it to the affected part. Therefore, it is required that the soil has a certain degree of water retention. Sandy soils have poor water retention properties and are generally not suitable for root-sinking methods. If this method is used, they should be administered in small amounts and reduce the loss of drugs.
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