Search results for " Median Lethal Time"
showing 4 items of 4 documents
Biological responses of Rhynchophorus ferrugineus (Coleoptera: Curculionidae) to Steinernema carpocapsae (Nematoda: Steinernematidae).
2013
Rhynchophorus ferrugineus (Olivier 1790) (Coleoptera: Curculionidae) is becoming a serious problem in Mediterranean areas where it is well-adapted, and now is present even in the United States (California). The infestations are primarily in urban areas where chemical control is not advisable and million of Euros are spent to control it. The effects of the entomopathogenic nematode Steinernema carpocapsae (Nematoda: Steinernematidae) on mortality, growth, as well as the immune activity of R. ferrugineus larvae, were investigated. R. ferrugineus mortality exhibited a positive trend with the dosage and duration of exposure to S. carpocapsae. The median lethal dose and median lethal time, impor…
Does the immune answer to Bacillus thuringiensis infection is the same in larvae, females and males of Rhynchophorus ferrugineus?
2021
Bacillus thuringiensis (Bt) è considerato un potenziale batterio entomopatogeno per la lotta al Rhynchophorus ferrugineus, coleottero da quarantena infestante le palme. In questo lavoro si considerano gli effetti dell’infezione di Bt in larve, maschi e femmine del punteruolo rosso. La patogenicità è stata valutata stimando la LD50 (Lethal Median Dose) e la LT50 (Lethal Median Time), il numero totale di emociti ed il tipo di emociti (Differential Haemocytes counts) ed inoltre l’espressione delle proteine Heat Shock Protein 70 (HSP70) negli emociti e nel cerebro. La mortalità di entrambi i sessi e delle larve aumentava all’aumentare della dose e del tempo di esposizione. Tuttavia le larve han…
Does Bacillus thuringiensis Affect the Stress and Immune Responses of Rhynchophorus ferrugineus Larvae, Females, and Males in the Same Way?
2022
Simple Summary Rhynchophorus ferrugineus is a destructive quarantine pest of palm trees, now widely distributed. Although broad-spectrum insecticides are often used to protect palm against R. ferrugineus, there is increasing concern about their effects on the environment and human health, especially where palm trees are located in urban areas. As an environmentally friendly entomopathogen, Bacillus thuringiensis (Bt) has been widely used to prevent other pest infestations. Although Bt products are the most sold bio-insecticides, there are still many interesting features to be investigated in the relationship of Bt and its hosts. We investigated the effect of Bt on larvae, females, and males…
Biological responses of Rhynchophorous ferrugineus to Steirnenema carpocapase: an example of a model system
2011
Rhynchophorus ferrugineus (Coleoptera: Curculionidae) known as the Red Palm Weevil (RPW) is becoming more and more of a problem in Italy, and especially in Sicily, where it is well adapted. The infestations are mainly in the urban areas, and for that reason, chemical control is not advisable. Data from literature show that entomopathogenic nematodes (EPN) control RPW quite successfully in the field. However, results coming from the laboratories are often in contrast with each other and no data are available on precise doses. In this context we studied the Median Lethal Dose (DL50) and the Median Lethal Time (TL50) of young and older larvae and also of adults. The doses for the adults were t…