Occurrence and Prevention of Safflower Disease
According to the Tacheng Agrotechnical Station survey conducted on May 11-14 and 17-18, there are red rust and safflower root rot in the Honghua field in the three counties and one city in the Tacheng Basin. Symptoms of safflower seedlings at the seedling stage: yellow spots appear on the stem base or leaves of the seedlings and form a reddish-brown spore heap, which is now in the red rosette stage. Symptoms of safflower root rot at the seedling stage: The roots and stems of infested seedlings darkened and atrophied, severe roots had decayed, and leaves were wilting and dry. The whole plant died. The survey selected 25 red flower fields from 13 village teams in 9 representative townships (fields) of 4 counties (cities) with an area of ​​1920 acres. The incidence of safflower rust is generally 5-15%, and the serious morbidity is 28%. The morbidity of safflower root rot generally ranges from 2% to 13%, and the incidence of serious land masses reaches 30%. Among them, the diseases of safflower in Tacheng, Emin, and Tori counties are relatively mild, and the safflower diseases in Yumin County are relatively serious. It is expected that in 2004 Tacheng City, Emin County, Yumin County, and Tori County saffron rust disease will appear to be more serious and occur locally, with an area of ​​400,000 mu. The occurrence period is from late June to late August. Root rot of safflower occurred moderately, with partial middle weight occurring, with an area of ​​200,000 mu. Look at the county agricultural technicians, do a good job of field disease investigations, timely grasp the dynamics of safflower disease, and guide local farmers to do a good job in the prevention of safflower rust and root rot of safflower. Prevention and control suggestions: 1. The emergence of safflowers is generally better this year, and the number of basic seedlings per acre is between 20,000 and 30,000. Currently, it is possible to combine fixed seedlings, remove plants that have rust and root rot, and bring deep burial outside the fields. In order to avoid spread of disease, there is a multiplier effect. 2. Do a regular investigation, early detection, early prevention and treatment. Chemical control may use triadimefon, carbendazim, thiophanate-methyl, and dextromethorphan. 3. Control methods: Scarlet rust disease begins with 15% of triadimefon 60-80 grams or 50% carbendazim 70-100 grams per acre. Root rot of safflower is sprayed with 70% thiophanate-methyl wettable powder 60-90 grams or 50% carbendazim 70-100 grams per acre in the initial stage of disease onset. Can also be irrigated root control, combined with irrigation with 95% of the enemy can be 300 grams of dexamethasone / mu, dubbed 10 kg dubbed mother liquor, slowly poured into the inlet water, so that the liquid evenly distributed in the water.