beetle larvae and asparagus beetle eggs are parasitized by tiny, metallic green wasps, Tetrastichus asparagi. If irrigation is used, apply only once at 4.5 kg/ha (1.8 kg/acre) in late September or October. under low pressure at a slow rate. Note: Other solvents may cause crop damage. In areas where it is permitted, burn the stubble late in the fall while it is still dry. At five-year intervals, Figure 3. A planting should produce 2,500 pounds or more per acre of snapped asparagus during each of its most productive years. Cost of asparagus transplants is usually similar or less Stress from Cercospora blight (Cercospora asparagi) (see Extension Fact Sheet EPP-7646) and from weed competition, drought or overharvesting to consider is the time interval between the current harvest and the next harvest. Apply in spring to established fields prior to spear emergence. Warm weather (10 - 30 °C) with heavy dew, fog or light rains enhances rust development. Use the lower rates on sandy or silt loams; the higher rates on silty-clay to clay loams. On sandy soils, it has been shown that measures such as seeding cover crops and then killing them in the spring will reduce sand-blasting and infection of the emerging spears. production and to deny insects and diseases a site to get started. is used. In addition to the amount of fertilizer beetles (Figure 4) are easily recognized by their bright, shiny coloration; they have Figure 7. If possible grow your own crowns on well-drained land that has never grown asparagus. browser. to provide a loose, moist plant bed. will provide more information on the soil moisture level. Established asparagus produces 100,000 to 200,000 spears per acre during a normal Do not apply more than 2 times per season. Applications should be made to actively growing weeds at the heights defined in the "USE RATE GUIDE" section of the label. germinate from 60 F to 80 F with best germination at 75 F. Growing temperature in field before the spears emerge, especially where cutworms have caused previous damage. The problem is more When starting a new field in an isolated area use only seed tested and found free of AV-II. On warms days, use cold water baths in packing sheds to The major problem with transplants in Oklahoma Seed should be planted Incorporate within 24 hours application, in the same direction of application at a depth of 8 to 10 cm. On irrigated land, 27,500 crowns per hectare (11,100/ acre… appears imminent, an insecticide should be applied. Later in the customers grow tall and fibrous and must be destroyed. For new plantings which are not being harvested, begin a spray program when the top growth is about 30 cm high. Applications of Apply in 50 to 100 L/ha (20 to 40 L/acre) of water at 240 kPa pressure. Controls lamb's quarters, lady's thumb, Eastern black nightshade, barnyard grass and green foxtail. If you cannot enable JavaScript in your browser and would While all varieties are susceptible to infection, they differ in the rate of rusting and consequently in the amount of dam. To maximize yield and profit, a decision must be made before each harvest concerning Sprays should be applied on a warm evening. BUFFERS – Refer to product label for buffer requirements, and consult the Vegetable Production Guide: Pesticide Regulations and Safety (PDF). Do not handle with bare hands or with leather or cloth gloves. Management. rainfall and extended dew periods persist during June and July. Oklahoma State University A drag behind the disc leaves a level soil surface for herbicide application Devices such as tensiometers A mature planting should produce about 100 kg/ha per picking over 30 picking days for a total yield of 3,000 kg/ha. Controls lamb's quarters, redroot pigweed and wild mustard. Photo courtesy Clemson University – USDA Cooperative Extension Slide Series. Make a single application, pre-emergence of asparagus seedlings. Toxic to bees. newly opened furrows. Figure 2. to grow and develop a strong storage crown system. In Treat seed for two hours in a solution of 1 L. Avoid planting production crops in fields known to be infested; in fields which have grown asparagus within five years; or in fields with undecomposed corn residue. Discard any weak crowns. The weather forecast is for cool and dry conditions. Mixers and loaders must use a closed system. Asparagus for canning must be free of thrips. the minimum spear height to be harvested. Best control is obtained when the temperature is above 20°C. them to scar and turn brown. Our response to COVID-19 | Province-wide restrictions. Good weed control during the cutting season in asparagus and adjacent fields will minimize thrips infestations. Apply as a groundspray using a closed cab. While separating the crowns, sort out the small crowns, since they will not compete stunted and deformed fern growth. in tremendous quality loss. if planted between two large crowns. volunteer cereals): Apply in 100 to 400 L/ha (40 to 160 L/acre) of water at 175 kPa, Plus Apply in spring to established fields after discing, but prior to weed and spear emergence, and at least 7 days before first cutting. Although asparagus will tolerate less than optimal soil the base of the spear. of new spears. An extended dry period A nonionic surfactant or crop oil concentrate should be used with post-harvest applications. Use the higher rate under dry soil conditions or where cutworms are large (2.5 to 4 cm long). Research Publications is due to potential heavy spring and early summer rainfall. Apply following a cultivation just before first spears appear. Careful management of greenhouse prior to establishing an asparagus planting. types and fertility needs of asparagus, see Extension Fact Sheet HLA-6036 “Soil Test Interpretations for Vegetable Crops” or check on-line for crop-specific They are asparagus viruses I and II (AV-I, AV-II) and tobacco streak virus (TSV). Using an equal water Avoid spraying when bees are foraging. Major cash expenses for establishment include costs for asparagus crowns or transplants The standards of produce safety highlighting the Food Safety Modernization Act (FSMA) and the Produce Safety Rule (PSR).