One of the best insecticides is Bordeaux mixture, which can either be bought or made.
Use modern insecticides and carefully sealed drawers or cases.
Though many of Browne's observations are in every way practical and intelligent, our current knowledge of safe, persistent, effective insecticides would not emerge for some fifty or sixty years after his death.
Three insecticides were tested at Anna, Illinois, Lindane, parathion, and tetra ethyl pyro phosphate, known as TEPP.
A great many new insecticides have become available during the last six or seven years.
The timely use of insecticides is the most effective means of combating most injurious insects, but if spraying is not possible, other methods can often be used to prevent or reduce damage.
The application of these insecticides requires more care, and is therefore more troublesome.
It is evident, therefore, that the time for the application of insecticides is the time when all the scalebugs are fixed, that is about the end of July or beginning of August.
Insecticides are used to prevent feeding by the adults in the spring.
While some systemic insecticides have shown promise, there is currently no registered chemical control method.
Chemical sprays have been successful in the past but at the present time no insecticides are registered for cottonwood leaf beetle control.
On ornamentals and shade trees, insecticides can be used to prevent unsightly damage.
If insecticides are used in the form of a powder, great care should be exercised to keep it from falling on other vegetation or fruit that might be eaten by man or beast.
The two general types of insecticides have already been mentioned--those that kill by poisoning, and those that kill by destroying the body of the insect.
Products of collateral industries, such as fertilizer, fertilizer ingredients, insecticides and fungicides, containers for foods and feeds, collateral products.
Insecticides should usually be applied with force in a comparatively coarse driving spray, but fungicides should be applied in a fine mist or fog so that they will settle on every part of the tree.
Therein lies the difficulty of applying insecticidesand fungicides together.
Wharton (1951) reported that cockroaches and other predators attacked mosquitoes knocked down by insecticides and affected the number recovered.
That the control of domiciliary cockroaches is far from satisfactory may be inferred from current entomological and pest-control journals in which new insecticides are continually advocated to replace others found to be inadequate.
Effects of liquid household insecticides on the oothecae of the German cockroach.
In addition, dyes, wood turpentine, dry ice and various insecticides are produced in Virginia.
This DDT and some of the other new insecticides are very easily decomposed, and, of course, that's one of the disadvantages of them.
Van Leeuwen just a day or two before I had to leave for the meeting, and he is not ready yet to say anything about it, but he has already tested some very promising insecticides as far as the control of weevil is concerned.
With the modern success in the application of insecticides and fungicides, and the extension of the practice of irrigation, the subject of gardening begins to be reduced to a scientific and (what is more to the point) a sure basis.
Since the successful introduction of DDT, promising new insecticides have become available more frequently and in greater numbers than ever before.
As a result, many newinsecticides have been developed and are available for general use.
In view of the short time the new organic insecticides have been available, work to determine their place in nut insect control programs is largely in the experimental stage.
Special care must be taken in handling concentrated insecticides preparatory to making diluted spray or dust applications.
If the trees can be sprayed thoroughly, arsenicals and other insecticides used in spraying apple orchards will be found very effective while the worms are small.
General Information Regarding the Use of the New Organic Insecticides ~Handling the insecticides.
DDT has been used more extensively than any of the other newer insecticides and for this reason there is considerable information relative to the spray concentrations known to be effective against insects susceptible to it.
These insecticides are also being sold for use as dusts, either ready to use or in a more concentrated form which can be reduced to dusting strength through the addition of inert material.
Other new organic insecticidesmay also be effective but have not been widely tested.
Rotenone, which, I believe, is one of your main insecticides in nut culture, is fairly effective on Japanese beetles.
The first of the new insecticides about which we heard was DDT.
Until the beginning of World War II a rather limited number of insecticides was available, such as lead arsenate, cryolite, nicotine, mineral oil emulsions, and rotenone.
During and since World War II, both in the United States and abroad, work on insecticides has been stepped up markedly.
Timely use of insecticides is the most effective means of combating many harmful species.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "insecticides" in a variety of sentences. We hope that you will now be able to make sentences using this word.
