Eksempler på aphid

• The parents were transferred to new bean plants to avoid overcrowding and early death of plants and aphids.

• Unlike spotted alfalfa aphid, vein chlorosis was not observed after spotted clover aphid feeding in this experiment.

• Daily fecundity (number of nymphs produced per adult per day) varied with time for both aphid species and in each experiment (fig. 2).

• Twenty-four hours later, the plants were checked to see if the founding aphid had settled and any nymphs produced were counted.

• It was demonstrated that this spider did not simply consume greater quantities of aphids because it was bigger.

• Each year winged aphids migrate into the area in early summer, and populations expand on adult cereal plants.

• However, aphids from tobacco were not sampled from other host-plants in regions where tobacco is not common.

• What is responsible for the apparent specificity of aphid resistance genes?

• In this paper the hypothesis that the aphids' antennae are crucial for the wing induction in the presence of natural enemies is tested.

• Such dramatic responses to aphid feeding are unusual and probably indicate the involvement of toxic aphid saliva or hypersensitive reactions of the cypress trees.

• However, why the correlation was only significant at the higher aphid densities and not at the lower aphid densities remains unclear.

• The model assumes that, initially, both aphids and natural enemies coexist at low densities (mathematically, at a stable equilibrium).

• This aphid migrates to other parts, including below-ground stems, and so space is less likely to be a limiting factor.

• In general, the treatments with the largest concentrations of alfalfa also had the highest numbers of aphids.

• The observed population outbreaks and subsequent crashes correspond, essentially, to the aphid population switching rapidly from one locally stable manifold to another.