Fire spiders, also known as wheat spiders or long-legged spiders, are common pests that affect wheat crops. Recently, red wheat spiders have been reported in several wheat fields in Beijing, covering approximately 50,000 mu. This article outlines the symptoms, occurrence patterns, and control methods of these pests.
Symptoms: Both adult fire spiders and nymphs feed on wheat sap, causing yellow and white spots on the leaves. As the infestation progresses, the leaves turn yellow, and the plants become stunted, sometimes leading to complete withering and death.
Occurrence: Wheat spider legs typically go through 3–4 generations per year, with adults and eggs overwintering in soil cracks. In March of the following year, the overwintering individuals emerge, and eggs begin to hatch. The peak breeding season occurs between April and May, during which the population reaches its highest level. By late May, adults lay summer eggs. These eggs hatch successively, causing damage to barley, completing a generation within 24 to 26 days. Wheat spiders can have 2–3 generations per year, with nymphs and eggs surviving in winter wheat and weeds. Between mid-March and late April, early insects are large and cause heavy damage, while by late April, the insect population declines. Summer eggs begin to hatch in October, forming autumn seedlings. Both types of wheat spiders mainly reproduce asexually. Long-legged spiders prefer dry conditions, with an optimal temperature range of 15 °C to 20 °C and a relative humidity below 50% . They are most active between 3:00 and 4:00 pm. During rain or dew, they hide in soil cracks and do not move. Penthaleus and similar species are more active before and after 4:00 to 8:00 pm. They are not drought tolerant, surviving best at temperatures between 8 °C and 15 °C, with humidity above 80% . Adults lay eggs in spring wheat tillers and clods, and in autumn, they reproduce on fibrous roots and clods. Eggs are laid in clusters, with each cluster containing over 10 eggs. Dry wheat fields are particularly vulnerable to long-legged spiders.
Control Methods: First, agricultural practices should be used. Crop rotation, proper irrigation, and shallow tilling after harvest help reduce pest populations. Second, chemical control is recommended. After the wheat turns green, inspect heavily infested fields. Select five random points, check 33 cm per point, and place white plastic cloth or a water basin. Tap the wheat stalks and count the number of insects falling. If there are more than 200 larvae per 33 cm, and if more than 20% of the blade has white spots, chemical control is necessary. Apply 1.8% abamectin at a rate of 1000 times or 50% malathion at 3000-5000 % diluted and spray uniformly. Alternatively, mix 75 grams of fine soil with 20 kg of 40% dimethoate EC to create toxic soil, then apply it to the field.
Â
Â
Aluminum Hung Window: Streamlined Elegance for Your Space
Elevate your home's aesthetics and functionality with Aluminum Hung Windows, a pinnacle of modern design. These windows seamlessly blend sleekness and practicality, adding a touch of refined elegance to any space. Crafted with precision, their aluminum frames offer a minimalist aesthetic, enhancing your home's contemporary appeal while maximizing natural light intake.
Effortless operation is a hallmark of Aluminum Hung Windows, allowing for smooth opening and closing with minimal effort. Whether you're looking to let in a refreshing breeze or enjoy unobstructed views of the outdoors, these windows provide the perfect solution.
Durability is paramount, and Aluminum Hung Windows deliver with their robust construction. Engineered to withstand the test of time, they offer long-lasting performance with minimal maintenance required, making them a reliable investment for your home.
Customization options abound, allowing you to tailor your Aluminum Hung Windows to suit your unique preferences and architectural style. Choose from a variety of frame finishes and hardware options to create a look that perfectly complements your space.
Enhance your home's curb appeal and create a welcoming atmosphere with Aluminum Hung Windows. Their timeless elegance and practicality make them a standout choice for any homeowner looking to elevate their living space. Experience the perfect blend of style and functionality with Aluminum Hung Windows today.
Aluminum Hung Window,Single Hung Glass Window,Vertical Sliding Windows,Automatic Vertical Slide Window
Foshan City JBD Home Building Material Co.,Ltd. , https://www.jbdhome.com