Viespi parazitoide şi influenţa lor asupra populaţiilor de dăunători forestieri

Parasitoid wasps are very important in reducingpopulations of little spruce sawfly (Pristiphora abietina Christ.), yearly percent of affected cocoons being between 23 and 35,2%. In laboratory conditions, 23% from the monitoredcocoons was affected by parasitoidwasps, the largest sharebeing owned byichneumonids (19%).Was identified 2 new species of ichneumonids forRomania fauna (Mesoleius ruficollis Holmgren and Ctenochira flavicauda Roman).It is necessary to be made researches in this domain, to know better the parasitoid complex and the significant importancein pest controland the protective measureswhich must be adopted by the forest management

The capacity of protecting the laser and neemazal products against the proliferation of the Colorado beetle (Leptinotarsa decemlineata say) in the concept of organic culture at the potato

In the treatment schemes for the Colorado beetle we can take into account among the chemical products which are largely used, the biological products of control, especially if it’s intended to obtain an organic culture of potato. The present paper intends to approach the efficiency of two bio-insect powders Lazer and NeemAzal on the viability of the pest in the conditions from Suceava, the experiments were carried out at S.C. D.A. Suceava in the year 2008 in field and laboratory. If we compare with the untreated witness, the egg hatching was in the ratio of 70-80% in 2-days period, on the treated lots with the two products, the hatching in the ratio of 60-70% was registered only after a few days, the “inhibitory” action of the hatching process maintaining even after the end of this process on the untreated lots

Rolul volatilelor emise de plante în „pregătire” (priming) la atacul erbivorelor

Jasmonates are the main signals in plant defence against herbivores, also being new weapons in plant defences. Oral secretions of insects are molecular patterns that trigger tritrofic relationships plant-pest- entomophagous, by releasing volatile. Priming plant by influence of volatile or internal signals produced by jasmonates, provides an increased resistance to pest attack. Only molecular approach in fundamental researches and in the management of the pests, assures knowledge of life phenomenology between plant and insect

The influence of the climatic conditions which contribute to the emergence of the hibernate adults of the Colorado beetle (Leptinotarsa decemlineata say) at Suceava

The reduced quantity of rainfall in the period preceding the emergence of the hibernate adults correlated with the mild and gradual warming of the soil and with the growth of the shinning period of the sun it makes that their emergence to be made with a few days earlier until two weeks. From a total of 25 emergences in the year 1976-1995 and 2005-2009, 68% from these were produced in April and only 32% in May. During 1976-1991 the tendency of emergence of the hibernate adults was towards the end of April and the first decade of May, following that in the last 10-15 years due to the general global worming, the apparition of the hibernate adults to be produced earlier, respectively the decade second and third of April