The high temperature and rain in summer is the peak period of migratory pests such as migratory locusts, aphids, and leaf miners. Rain and these migratory pests are also vectors of viral diseases, which brings about the cultivation and management of summer vegetables. Great difficulty. Under normal circumstances, the probability of vegetables infected with viral diseases in summer months is 60%-100%. Examples of vegetables that have become infected due to viral diseases often appear in production. If we can cultivate vegetables and succeed at the peak of viral disease, we will greatly increase economic efficiency.
In the summer, using the winter period of the greenhouse, it is easy to cover it and grow vegetables to avoid large areas of viral disease. If the greenhouse does not remove the old film from the previous year, the sagging film around the shed can be taken up for ventilation. Throw some fresh grass on the film and shade the leaves to prevent heat. Then the gauze around the greenhouse can prevent whitefly, aphids, leafminers, and thrips from flying in and cut off the transmission of viral diseases. In this way, vegetables that are cultivated in summer can be sprayed only once or twice with pesticides to avoid the occurrence of viral diseases.
In China, nervous system drugs are also one of the drugs with the most rapid sales growth in recent years. In 2002, nervous system drugs occupied 5.9% of the entire pharmaceutical market share, and the total sales amount increased by 9.4%.
With the increasing trend of urbanization and aging, the elderly population in China has exceeded 120 million, and the incidence of geriatric diseases, especially mental diseases, is increasing year by year. With the increase of residents' income, the elderly's requirements for quality of life also increase. As a result, the demand for drugs to treat mental illnesses such as Alzheimer's has soared. In WHO drug classification, psychotropic drugs and nootropic drugs are grouped into one class. We briefly analyzed the development trend of this class of drugs through the clinical drug use data collected from more than 300 domestic key hospitals by Chinese Pharmaceutical Association.
The overall market size of this class of drugs is about 1.22 billion yuan, the consumption sum increased by 5.0% in 2002, but the sales quantity increased by 11.2%. The main reason why the consumption sum did not increase with the sales quantity is that several main varieties of this class of drugs, such as piracetam, cobalt bin amide and ginkgo biloba leaf, etc. In 2002, the price of selling units fell sharply due to bidding. Among these drugs, ginkgo biloba preparation occupies the largest market share, accounting for more than 1/3 of the market share, ganglioside ester and cobalt bin amide combined also occupy nearly 1/3 of the market share, piracetam and other "sitan" drugs occupy nearly 10% of the market share, the rest of the drugs occupy less than 5% of the market share. At present, more than 20 ginkgo leaf production enterprises, piracetam production enterprises more than 70, have entered the stage of price competition, profit repeatedly diluted.
In the first-line varieties, except ginkgo biloba leaves preparation maintained vigorous vitality, the growth of other varieties were weak, especially the traditional variety piracetam suffered from bidding
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