I. Sowing Stage: Source Control to Build a Strong Foundation
The sowing stage is a critical starting point for wheat pest and disease control, as it directly determines the occurrence base of pests and diseases later in the season. Neglecting control measures at this stage can lead to frequent pest and disease outbreaks later. The focus is on initial pest control, disease prevention, and cultivating healthy seedlings, with an emphasis on treating seeds with appropriate pesticides to lay a solid foundation for wheat growth.
Treating seeds with Difenoconazole + Imidacloprid, Clothianidin + Imidacloprid, Thiamethoxam, or Fluoxastrobin + Fludioxonil + Thiamethoxam can help prevent underground pests (e.g., White grub, Wireworm) and Aphids. Using Difenoconazole for seed coating can prevent diseases such as Take-all and Loose smut, while Tebuconazole can prevent Rust disease and Fusarium head blight.
II. Emergence, Green-up, and Jointing Stages: Precision Control to Develop Robust Plant Architecture
During this phase, wheat transitions from the seedling stage to a period of vigorous vegetative growth. The plants have relatively weak resistance and are susceptible to pest infestations and diseases such as Sharp eyespot. At the same time, efforts should focus on cultivating robust plant architecture to lay a foundation for subsequent heading and grain filling.
Spraying with pesticides such as Abamectin, Imidacloprid, or Thiamethoxam can control Spider mite, Aphids, and underground pests. Using fungicides like Thifluzamide + Hexaconazole, diluted in water and sprayed with emphasis on the stem base, is key for controlling Sharp eyespot. A small amount of foliar fertilizer (e.g., Potassium dihydrogen phosphate) can be added to supplement nutrients, enhance plant stress resistance, promote healthy seedling growth, and reduce weak seedlings.
III. Heading, Flowering, and Grain Filling Stages: "One Spray, Three Protections" for Stable Yields
The "One Spray, Three Protections" strategy is a crucial measure for pest and disease control during the mid-to-late growth stages of wheat. It effectively controls pests and diseases, prevents hot dry winds, delays senescence, promotes grain filling, and increases grain weight, playing a vital role in ensuring stable and high wheat yields.
"One Spray, Three Protections" is not a simple mixture of pesticides. The core principle follows the combination of fungicide + insecticide + plant growth regulator/foliar fertilizer. Adjustments should be made flexibly based on field pest and disease conditions, variety resistance, and climatic factors to achieve multiple effects with one spray while avoiding antagonism and the risk of phytotoxicity.
During the heading and flowering stages, fungicides such as Phenamacril + Tebuconazole can be used, focusing on controlling Fusarium head blight while also managing Stripe rust, Powdery mildew, and other diseases. The first application should target the critical period from full heading to early flowering, adhering to the principle of "spray when flowers appear." During the grain filling stage, insecticides like Thiamethoxam + Lambda-cyhalothrin should be used, focusing on controlling Aphids. Adding Potassium dihydrogen phosphate and Brassinolide supplements nutrients, extends the functional period of leaves, promotes fuller grains, and enhances stress resistance.
IV. Maturity Stage: Monitoring to Protect Yield and Quality
During the maturity stage, plant growth is stable, and the probability of pest and disease outbreaks significantly decreases. Large-scale spraying is generally not required. Strengthen field inspections, with a focus on monitoring the last wave of Ear aphid, to avoid impacts on yield and quality.
