First, the morphological characteristics
Asparagus is a Thripidae that is a member of the family Thripidae. The main damage is as a flower thrips and a thrips, and it is a sucking pest. It has a wide host and is seriously endangered. The adult body is small, 1 to 1.3 mm long, yellow-brown head and chest, deep back, narrow, long, transparent, thick tentacles, compound eyes purple. Eggs 0.2 to 0.3 mm long, initially kidney-shaped, milky white, gradually become oval, yellow-white, red eyes can be clearly seen. The nymphs were 4 instar. The 2nd instar larvae were about 1 mm in length. The pale yellow, chest, and abdomen had fine brown spots and coarse hair; at the fourth age, the wing buds were obvious and did not feed, but they could be active and called pseudo. pupa.
Second, the characteristics of damage
Asparagus thrips The adults, nymphs damage asparagus leaves, shoot tips, tender stems, scales, petals, etc., mainly suck the stem sap. Causes the tender stems to be stunted and the harvested shoot stems are loose and curved and deformed, easily dissipating their heads and severely degrading product quality. In severe cases, the plants are clustered and dwarfed, causing the fall to fall. The asparagus cannot effectively photosynthesis and the accumulation of nutrients, and there is almost no yield or very low yield in the damaged plots in the spring of next year.
From May to June, when the nursery of asparagus was damaged by thrips, the leaves rapidly yellowed and shrunk, and the dwarfing did not grow. The seedlings that have just been unearthed are affected and even if they are prevented and treated in time, the seedling rate will be greatly affected. The newly planted bamboo shoots were found to be damaged by the thrips. Overall, asparagus plants were of different heights. The leaves of the damaged plants did not grow upwards. They were clustered, dark in color, and had no new leaves. They were 40% to 60% shorter than normal plants. Virus hazards, such as gently tapping the top of the asparagus by hand, will find that many thrips focus on harm. Under normal circumstances, land where fertilizers and fertilizers are scarce is heavy, and when light and humid, the damage is lighter. Sandy lands are more serious than land; rainy waters occur in light or rainy seasons, and the number of insects after storms can be significantly reduced. The land was lighter.
Third, comprehensive control measures
1. Agricultural control. In spring, the weeds around the shoots are removed in time to eliminate the insect source on the overwintering host. Strengthen the management of fertilizers and waters. When the weather is dry, water is used to irrigate horses to increase plant resistance and reduce damage. After clearing the garden, combine the bismuth soil drying root spray anti-stem blight medicine, add 2.8% abamectin 2000 times solution or 40% phoxim 800 times solution to spray the ground and the root of asparagus to control the damage base of thrips. , Lower the number of groups.
2. Physical control. The swatches are used to slay and kill the hummocks, the swatches are blue or yellow, and the density is trapped and killed by 1 block per 25 to 30 m2. In the field of asparagus application of silver-gray strips or silver gray insect nets to avoid pests, repellent field pests. In open field nursery, it is best to use insect nets or shade nets to cover seedlings to reduce the risk of thrips damage. Because the asparagus seedlings are very sensitive to the medication, taking protection seedlings is the most effective measure to prevent thrips damage.
3. Grasp the critical period of flowering medication. Spinosad or spinosad can be used to control the effect, long duration, no phytotoxicity, low toxicity to humans and mammals, no chronic toxicity. With 2.5% spinosad suspension agent 1000 ~ 1500 times evenly spray, focusing on the tender stem, shoot tip and other young tissue and other parts. After release of the asparagus, spray once every 7-10 days, and spray 2 or 3 times.
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