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草坪阔叶杂草图文识别与防除
编辑:郭海滨   出处:南京农业大学杂草研究室   时间:2009-3-7 16:29:25

To control weeds effectively they must be classified as broadleaf, grassy, or sesdges. Knowing the life cycle of a weed is important when scheduling applications of herbicides.

The dandelion is a classical broadleaf weed. It has a colorful flower, a tap root, and intersecting veins on leaves. The dandelion is a cool-season, perennial, broadleaf weed. Common chickweed is another cool-season, broadleaf weed, but is an annual weed.

 

 Identifying weeds in the seedling stage is critical to their control. This illustrates knotweed in the early spring. Knotweed is a warm-season, annual, broadleaf weed and can be effectively controlled with herbicides in the seedling stage.

 

 This plant in the immature stage bares little resemblance to the mature plant. In the immature stage the weed can be readily controlled with herbicides. Mature plants are very difficult to control. This is the Blackland aster, a warm-season, annual, broadleaf weed.

 

 The Blackland aster after maturity in late summer. In the mature stage the plant has numerous flowers and a very wiry texture in contrast to the succulent nature of the immature plant.

 

Henbit is another cool-season, annual, broadleaf plant.

 

 

Spotted spurge is a warm-season, annual, broadleaf weed. As illustrated here, the plant will dominate a bermudagrass turf.

 

Sow thistle is a cool-season, annual, broadleaf weed.

 

 

White clover is a cool-season, perennial, broadleaf plant. In a pasture white clover is very desirable. In turfgrasses clover competes with the grass and is generally undesirable.

 

Burweed, the plant in the center of this slide, is a cool-season, annual, broadleaf weed. The plant in the mature stage is covered with prickly spines tha t make it undesirable on sports fields, golf courses, and playgrounds.

 

Matchweed is a warm-season, perennial, broadleaf weed.

 

 Virginia buttonweed is another warm-season, perennial, broadleaf weed that is very competitive with all turfgrasses.

 Broadleaf weeds can be effectively controlled with hormone-type herbicides if they are applied during the proper life stage of the weed. Mature broadleaf weeds are very difficult to control with hormone-type herbicides. All hormone-type herbicides are postemerge chemicals and are most effective during the seedling stage of the plant. These are examples of postemerge chemicals used for broadleaf weed control.The column on the right illustrates products that can be purchased. The Lawn No.4, Lawn No.1, 2,4D of the herbicide are available to provide a broader spectrum of control of broadleaf weeds.

 Pigweed after the application of a hormone-type herbicide. Again, showing distorted growth of the plant. Postemerge products are most effective on young, actively growing plants during warm temperatures. The effectiveness of most products is improved by the addition of a surfactant or wetting agent.


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