The main diseases in the summer corn ear stage are large spot disease, small spot disease, and rust. Prevention and treatment of large spot disease and small spot disease can be sprayed with bactericides such as 10% Shigao, 50% chlorhexidine or 70-generation Mn-Zn in the early stage of the disease, with continuous application for 2-3 times at intervals of 7 days. Prevention and treatment of brown spot and rust can be controlled by spraying 25% powder rust WP 1500-1500 times or 50% carbendazim 500 times at the beginning of the disease, with an interval of 5-7 days and 2-3 times. At the peak of spores, spray with 97% rust sodium solution 250-300 times or 50% sterilized WP 800 times, once every 7 days, and prevent 2-3 times. Spraying 10% double-effect spirit 200 times solution before and after jointing and tasseling can effectively prevent corn stalk rot.
Summer corn pests are mainly corn borers, aphids and red spiders. For the prevention and control of corn mash, you can use 1.5kg of phoxim granules and 0.5kg of fine sand in the small bell mouth and big bell mouth, and mix it into the heart leaf. The dosage of the plant is 1.5-2g. It can also be used with 90% crystal trichlorfon 1500~2000 times liquid; or 75% phoxim emulsifiable concentrate 3000~4000 times liquid filling or topping of the ear, 10 ml per plant. For controlling aphids, spray with 40% omethoate EC 1500 times solution, or 10% imidacloprid WP 1000 times solution, or 50% anti-Converse WP 2000 times solution, or 10% beta-cypermethrin 1500 times solution. For the control of red spider, avermectin (1.8% worm, 1.8 bliss, 0.9% quercetin) 2000-3000 times solution, or 20% hydrazine 2000-3000 times solution, or 10% liuyangmycin 1500 times liquid spray control. In the middle and late stages of corn growth, 20% paraquat water can be used to spray the grass.
The advantage of the plastic centrifuge tube is that it is transparent or translucent, its hardness is small, and the gradient can be taken out by the puncture method. The disadvantage is that it is easy to deform, has poor corrosion resistance to organic solvents, and has a short service life.
Plastic Centrifuge Tubes have caps, which are used to prevent sample leakage, especially when used for radioactive or highly corrosive samples. It is very important to prevent sample leakage; the tube cap also has a function to prevent sample volatilization. And support the centrifuge tube to prevent deformation of the centrifuge tube. When choosing this point, you should also pay attention to check whether the tube cover is tight, and whether it can be tightly covered during the test, so as to achieve the inversion without leakage;
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