Reasonable selection of pesticides Some pesticides (such as dimethoate) are greatly affected by temperature, and their efficacy is significantly weakened with the decrease of temperature, while some pesticides (such as omethoate) are less affected by temperature, even in comparison. At low temperatures (below 15 ° C), it also exerts its normal insecticidal action. Similar to omethoate, there is also a pyrethroid, which is more toxic at low temperatures (15 ° C) than at high temperatures (25 ° C). Therefore, in winter and spring low temperature seasons to control crop pests and diseases, we must pay attention to the use of pesticides with less temperature impact.
Properly increase the dosage of pesticides in the low-temperature season. Under the guidance of professionals, increase the dosage and increase the concentration of the liquid, but not exceed the “safe high concentration†(ie, the maximum allowable dose without phytotoxicity).
Improve the application method in winter and spring to prevent greenhouse crop pests and diseases, try to use the smoke method or dust method; if spray application, reduce the number of prevention and discharge and the amount of liquid spray to prevent excessive humidity in the shed.
Appropriately extend the safe interval. In the low temperature season, the degradation rate of pesticides is slow, and the residual time in the crops is relatively long. It is necessary to appropriately extend the number of days (ie, the safety interval) of the last application of the crops to ensure food safety.
Corner cube Prism is also named retroreflector or trihedral prism.In the corner cube prism,three reflecting surfaces are perpendicular to each other,like the side wall of the cube.The input surface is perpendicular to the cube diagonal. Disregarding the anlge of the incidence,the output beam is parallel to the input one,but it is of opposite direction. Inset of the several corner prisms, for better matching,their extrance exit surface is often hexagonal.In case of this prism the phenomenon of full internal reflection occurs so it is not necessary,(however it is possible)to put mirror coating on the reflecting faces. Normally the reflection surfaces are AL reflection coating, and then covered with Cu and Black painting.
Pyramid prism/Corner Cube Retroreflector is always used to reflect the beam entering the prism face, regardless of its orientation to the beam. Corner cubes are widely used where precision alignment is difficult.
Corner Cube Prism
Corner Cube Prism,Corner Cubic Prism,Optical Corner Cube Prism,Glass Corner Cube Prism
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