Considerable concern and confusion exists regarding the problem presented by the present occurrence and potential spread of halogeton (Halogeton glomeratus) (M. Beib) (C. A. May) in the United States. It is now 18 years since this weed was first found near Wells, Nevada. Since that time the plant has been reported from a broad region extending from Lassen county, California to the southern edge of Montana.

Since 2,4–D became recognized as a weed killer, thousands of experimental plots have been sprayed with this and numerous other chemicals. The various weed conferences have prescribed uniform experiments with uniform rates and dates of application, but there has been no uniform method of application. In order to apply the minute quantities of chemicals needed on small plots, it is absolutely essential that a constant pressure and speed be maintained and that uniform coverage of the entire plot be obtained.

The pre-emergence use of herbicides offers a means of controlling weeds during the extremely critical period immediately following planting. Weeds can usually be controlled by cultivation if the crop makes a few weeks’ growth before weeds emerge. However, it is practically impossible to mechanically control weeds which emerge ahead of or with the crop.

Quackgrass (Agropyron repens) is a weed of major importance in the northern regions of the United States where cool, humid climatic conditions prevail. In the areas of Wisconsin having a heavy red clay soil, the weed is especially troublesome for the soil characteristics hinder the most effective use of cultural control measures. The fact that quackgrass can be found on the majority of the farms in northern Wisconsin is evidence that effective methods of quackgrass control are not being used. The question arises of whether generally recommended methods of quackgrass control are effective under the conditions prevalent in this area. The present study describes the results obtained during 1947 and 1948 at the Ashland Branch Experiment Station using several combinations of tillage, cropping and fertilization. An attempt was also made to compare the value of two methods of estimating quackgrass infestations.

The discovery of the herbicidal properties of 2,4–dichlorophenoxyacetic acid (2, 4–D) created a great impetus in the search for new herbicides. As the herbicidal properties of 2,4–D became more generally known, it was obvious that many closely related chemicals and other organic compounds should be evaluated for their herbicidal properties.

Many different types of water weeds are found infesting the drainage and irrigation systems in south Florida, where a subtropical climate is very favorable for rapid growth.