Sentences with phrase «aphid populations»

The aphid population, Losey found, fluctuates depending on the type of predator in the area.

Not exact matches

«Natural enemy populations can actually manage twospotted spider mites and hop aphids,» said Calderwood.

The body colour of Robichon's lab aphids is affected by environmental conditions, with the cold favouring green aphids, optimal conditions resulting in orange ones and white ones appearing when the population is large and faced with limited resources.

The experiments investigated both top - down (driven by predators) and bottom - up (food or resource limited) effects of the lights on the population density of a species of pea aphid, and in the presence and absence of predators including ladybirds.

This aphid species seems to be therefore the sum of populations possessing different karyotypes that in turn can give diverse genetic / ecological / evolutionary responses in relation to imposed selective environmental forces.

Recent data published in the international journal Comparative Cytogenetics by Mauro Mandrioli, Federica Zanasi and Gian Carlo Manicardi of the University of Modena and Reggio Emilia (Italy) clearly showed that populations of the green peach aphid Myzus persicae (one of the most dangerous pest crop insects in the world) may have unusual karyotypes due to chromosomal fragmentations and / or rearrangements also within the same individual.

In a new study published in the journal Scientific Reports, Hasegawa and his students, including Saori Watanabe, investigated how population growth of aphid morphs differs with or without the presence of ants.

Populations of some aphids, caterpillars, mites, and other invertebrates are sometimes drastically reduced by naturally occurring pathogens, usually under conditions such as prolonged high humidity or dense pest pPopulations of some aphids, caterpillars, mites, and other invertebrates are sometimes drastically reduced by naturally occurring pathogens, usually under conditions such as prolonged high humidity or dense pest populationspopulations.

re Dan H. 541 — that's what I meant by human population dynamics being «fortunately complex» — that it helps to control our population growth by being nice to each other (in specific ways), as opposed to how we would control deer or lady bugs (or aphids) or gypsy moths, etc. (would that change if deer reached a stage part - way between subsistence and affluence?