Pine and cypress herbicide, nursery herbicide

Nursery Herbicide Forestry Special Herbicide White Pine Herbicide Oil Pine Herbicide --- Weil Herbicide

Belongs to the diphenyl ether class of herbicides, providing effective control against over 100 common grass and broadleaf weeds in farmlands; offers long-lasting soil residual activity: safe for various pine, cypress, and fir seedling species. Registered as a conifer seedling herbicide by the Ministry of Agriculture in 2002.

Product Features

● Safe for conifers at all growth stages except within approximately 50 days after emergence; safe for hardwood cuttings of broadleaf species before leafing.

● Does not harm root systems, avoiding potential growth inhibition in seedlings.

● Combines soil treatment and foliar application methods, allowing flexible herbicide use.

● High activity and broad-spectrum weed control; effective against both grass and broadleaf weeds when applied alone either pre-emergence or early post-emergence.

Registered Uses, Target Weeds, and Application Methods

Scope of application: Weed control in conifer seedling nurseries such as white pine, oil pine, larch, Huashan pine, Mongolian pine, oriental arborvitae, and Chinese fir; herbicide for seedling stage and weed control in broadleaf cutting propagation, directed weed control under broadleaf tree canopies; orchard weed control.

Factors Influencing Herbicide Efficacy

● Weil is a photoactive herbicide; sufficient sunlight enhances its efficacy.

● For soil treatment, the surface soil should be clean, level, and finely textured to ensure uniform and continuous distribution of the herbicide layer.

● Maintain appropriate soil moisture and air temperature. Drought reduces efficacy, so manual irrigation should be performed promptly.

● Avoid rainfall or manual watering within hours after application to prevent washing off weed leaf surfaces or affecting soil adsorption of the herbicide.

Mixing Techniques

For foliar application, when grass weeds are older or mixed with perennial grasses, Weil can be mixed with post-emergence herbicides like Gallant, Fusilade, or Quizalofop-ethyl.

Summary of the Relationship Between Weil's Safety, Application Methods, and Weed Distribution (Excerpt)

Safety

● Conifer species (pines and cypresses)

For conifers that emerge with protective seed coats, Weil can be applied pre-emergence for soil sealing without affecting seedling germination.

However, from emergence until the development of true leaves and secondary lateral roots (approximately 6-8 weeks after emergence), application may cause damage. Avoid use during this period.

Between 50-60 days after application (after true leaves and secondary roots develop, up to 100 days post-emergence), physiological resistance is not fully formed, but root development improves and buds are protected by scales, allowing post-emergence foliar application.

After 100 days post-emergence, morphological protection changes, but physiological resistance is established, permitting post-emergence foliar application.

In subsequent growth stages (e.g., transplanting, afforestation), Weil is safer and can be used for soil or foliar treatment based on weed occurrence.

● Hardwood cutting propagation of poplar, willow, and ornamental broadleaf woody plants

For species with buds protected by thick scales, soil treatment is safe before leafing. After bud break and leaf exposure, contact damage may occur. Use only during safe periods with soil treatment. Note: Ridge planting is common, requiring higher dosage (120-140 ml/mu) for effective control.

Application Methods

After confirming safety during growth stages, choose application based on weed emergence. Use pre-emergence soil treatment when no weeds have emerged (e.g., post-sowing for conifers, early transplanting, pre/post-cutting for broadleaves). For emerged weeds, use post-emergence foliar treatment (e.g., after true leaf and secondary root development in conifers, or in later growth stages).

Soil and foliar treatments differ in dosage and water volume. Soil treatment requires longer residual activity: 50-100 ml/mu (varies by region and species) with 45-90 L water for uniform distribution. Foliar treatment targets emerged weeds with lower dosage but higher concentration: 40-50 ml/mu with 15 L water.

Weed Distribution

After determining safe application periods and methods, weed species distribution affects control efficacy.

● Generally, Weil effectively controls small-seeded annual weeds pre-emergence or early post-emergence.

● For large-seeded weeds or those with protective emergence, soil treatment may not work, but early post-emergence foliar application can control them.

● Perennial weeds at germination stage, similar to small-seeded annuals, can be controlled pre-emergence or early post-emergence.

● Early post-emergence foliar application on perennials emerging from roots/rhizomes causes contact damage, but regrowth may occur due to strong root systems. However, it delays growth and reduces competition with trees.

Thus, Weil is ideal for areas dominated by annual weeds (nurseries, farmlands, green spaces), with better spectrum and efficacy in early post-emergence foliar treatment. Efficacy decreases in areas with perennial weeds from roots/rhizomes (e.g., logged areas, wastelands).

In summary, the relationship between safety, application methods, and weed distribution is as follows:

1. First, determine if it is within the safe application period based on the target tree species' growth stage;

2. During the safe period, choose soil or foliar treatment based on weed emergence;

3. Assess control efficacy based on weed species distribution;

Finally, decide if applying Weil will achieve the expected control效果.