Sorfa Cell Culture Dishes are usually used to culture bacteria as disposable laboratory consumables which are manufactured from raw materials of high transparency polystyrene. Cell culture dishes are available in two sizes of 60 mm and 100 mm for bacteria culture and are rounded by serrated rings on the dish base. Serrated ring help users easy to grip dish, stabilize it in hands and avoid dropping it from hands. In addition, serrated ring also make a great contribution to easily detaching lid from dish base. Cell Culture Dishes Disposable Petri Dishes,Plastic Petri Dishes Zhejiang Sorfa Medical Plastic Co., Ltd. (Ningbo Jiangdong Aron Imp&Exp. Co.LTD) , http://www.sorfapipettes.com
Four vents are molded on inner surface of each lid for the function of exchanging gas which is indispensable design for bacterial culture. On the dish bottom, numerical codes of 3, 6, 9 and 12 are graved on outer surface to identify cell growth location. Ring on lid stabilize dish when stacking multi layers for saving space. All Sorfa Petri dishes are packaged in bags with sterilization, RNase-free, DNase-free and Non-pyrogenic.
The Prevention of Pests and Diseases of Maize Seedlings
The great occurrence of corn seedling diseases and pests is a new problem in corn cultivation in recent years, which poses a threat to corn production and seriously affects the yield. 1. The control object 1 Maize seedling pests are mainly used to control pests such as corn borer, stem borer and other barnyard borers that are harmful to the corn growth point, and also to prevent underground pests and aphids, ash, and other pests such as ticks, golden needles, ground tigers, and earthworms.è™± and other spread virus pests. 2 Diseases of corn seedlings should be based on the prevention and control of Fusarium moniliforme as the pathogen, to strengthen the disease prevention of seed propagation, prevention and control of seedling blight, zinc deficiency, and ketchi disease. 2. Prevention and control methods Maize seedling pest control should adhere to the principle of “prevention-based, comprehensive prevention and controlâ€, focusing on agricultural control, selection of disease-resistant varieties, and at the same time do seed treatment, reasonable fertilization, appropriate use of pesticide control, can effectively control and Reduce the occurrence and harm of the first phase of pests and diseases. 1 Implement crop rotation, deep fall in the autumn, clean the garden, apply decomposed organic fertilizer, reduce insects, bacteria source. Select strong resistance varieties, sowing before sowing 1-2 days, in order to improve the enzyme activity, increase agricultural fertilizer and phosphorus, potassium fertilizer. 2 with 5O% triadimefon seed dressing by 0.3%, to prevent smut and full-blown disease. 3 Use seed coating or use 50% phoxim EC per acre 200-250 g plus fine soil 25-30 kg mix well after the ridge strip application, or use 3% phoxim granules 4 kg mixed fine sand Application of underground pest control. 4 Properly dense planting to ensure sufficient nutrient area per plant, strengthen field management, and timely shovel. 5 For the field crops of corn borer and stalkworm, use 50% dichlorvos 400 times solution or 40% dimethoate 500 times solution to spray roots, or use 90% trichlorfon 300 times solution to control the spray roots. Occurrence of aphids can be used 40% dimethoate EC or 40% omethoate EC 2000-3000 times spray control, concurrent treatment of planthoppers. 3 Use 25-30 kg of 0.2%-0.3% zinc sulphate solution per acre to conduct foliar spraying to prevent and treat zinc deficiency during the 4-5 leaf stage of maize, and increase the disease resistance of the plant.