Probleme der chemischen Bekämpfung schädlicher Tiere im Walde
Spraying Toxaphen against mice in forest cultures seems to be doubtful on the strength of side effects. The effectiveness of toxic baits for mice control should be increased by raising attractiveness as well as by reducing the size of baits. Experiments showed that Tetrachlorvinfos can be used forHylobius-control in place of DDT. Within young coniferous stands cleared by chemicals bark beetles can be controlled by felled stems sprayed with BHC. For avio chemic measures against larvae in the crowns of conifer the best results were obtained by using insecticides mixed with Diesel oil.
Waldschutz und DDT-Verbot
SummaryForest protection and ban on applying DDT
 The bans on applying DDT enacted by the governments of BRD an other States are founded politically but not scientifically, DDT is the best and most harmless insecticide we ever have had. Its accumulation within the fat body of animals and men for a certain time does not cause pathological symptoms. Some effects unfavourable to wildlife animals are consequences of incorrect application.In forest protection in Germany DDT is needed also in future for controlling the weevielHylobius abietis, the lepidoptersRhyacionia buoliana andChoristoneura murinana as well as the sawflies of genusDiprion. It is demanded of the legislator to prolong the use of DDT in these cases until equivalent insecticides have been found. Lindan (γ-BHC)-compounds are not suitable for controllingHylobius beetles.
An investigation of the toxicity of insecticides to birds' eggs using the egg‐injection technique
SUMMARY 
 
Twenty-five insecticides have been tested for their toxicity to hen embryos at various concentrations, using an egg-injection technique. Of the two major groups, the organophosphorus compounds are much more toxic than the organochlorine. Most organophosphorus compounds lower the hatch rate and cause teratogenic effects at 100 ppm. Most organochlorines do not harm the embryo at high dosages (up to 500 ppm), with notable exceptions to this among the cyclodienes. However, starvation of the hatched chicks suggests that the majority of organochlorine compounds can kill at this stage, though fed chicks survive. The solvent used affected toxicity; in general, insecticides are more toxic to the embryo when dissolved in corn oil than when dissolved in acetone. If these findings can be applied to wild birds, it can be assumed that the vast majority of insecticides are harmless to birds' eggs. They are either not toxic in the concentrations so far found in this country, or else unlikely to pass through the mother bird to the egg.