Door Viewers
The door observer is a small optical instrument installed on the door of a residence, which is convenient for residents to observe the outdoor situation. Has become a necessity for home safety.
To ensure the quality of this Reliable Solid Brass Door Viewers we have strict quality control from material processing, polishing, assembly and packaging. Extensive experiences, mature technology and professional service allows us to meet the different needs of customers of different regions.We produce Door Hardwares of various functions and styles, fits perfectly to all kinds of frameless shower enclosures. Special requirements and sizes are available. Please just feel free to contact us if you have any question. Our team is on call for 24/7 to provide the worry-free before/after-sale service.The Door Hardware produced by our company includes door viewers, Door Hinges , Door Stoppers, Door Holders, Door Guards , door selectors, Door Hang Wheels and other series of hardware products, which can meet the installation needs of all building materials.
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According to the investigation of grass-trapping and field insects, it is expected that the occurrence of large and wheat armyworms will be delayed this year, and the occurrence is moderately light. The specific basis is as follows:
1. Period of occurrence
According to the test area from March 1st to April 12th, the grass will be tempted, and the egg will be seen on March 21st. The peak of spawning will be March 28-30, which is about 10 days later than that in 2003. The egg hatching observation and egg hatching peak On April 9-11, the peak of the third instar larvae in the field is expected to be at the end of April.
2. Amount of occurrence
According to the test area, the average number of eggs was 1.9, which is similar to that of the year of 2003. It is a mid-lighter year. The survey area was surveyed on April 13th, with an average of 3,200 insects per acre, ranging from 0 to 10,000. The amount of occurrence between the fields is extremely uneven.
Second, gray rice blast
On April 14th, the survey area surveyed an average of 41,200 insects per acre, ranging from 2.5 to 63,000. As the temperature rises, the amount of insects in the field will increase significantly.
In addition, there are more aphids in the current size of wheat fields. According to the survey on April 13th, there are 293,000 aphids per acre.
Third, prevention and treatment opinions
According to the above situation, combined with the poisoning of gray rice blast in the past year, the occurrence of stripe leaf blight and black streak dwarf disease in a few paddy fields in our city, from the perspective of comprehensive prevention and control, the following prevention and control opinions are proposed:
1. Control object field: all sizes of wheat fields.
2. Proper control period: barley April 20-25, wheat April 25-30.
3. Pesticide control: 10% sputum per mu or 18-20 g water plus 3 backpack spray for gray rice blast and aphid, but for some particularly late maturity and black field and field insects Add 90% crystal trichlorfon 75 grams to treat the armyworm.
It is composed of a concave lens (objective lens) and a convex lens. The focal length of the objective lens is extremely short, it makes the outdoor person or object into an upright and reduced virtual image, which falls just within the focus of the eyepiece, and finally a reduced upright virtual image is obtained, which is exactly at the clear viewing distance of the human eye. Nearby, you can see the situation outside the door clearly.
Occurrence and control of large, wheat armyworm and gray rice blast
First, the armyworm
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