#Entomopathogenic

2024-04-17

A #nematode #gel to protect #crops in Africa and #Asia

The fall armyworm is a destructive corn pest that recently arrived in Africa and Asia from the #Americas and began causing major yield losses and increased use of #insecticides, which pose #environmental and human health #risks.

#Entomopathogenic #nematodes are soil-dwelling roundworms that can #parasitize and kill fall armyworms with no risks to people or the #environment, but application can be tricky because the nematodes are susceptible to desiccation and UV radiation from sunlight.

Patrick Fallet and colleagues report success using an innocuous #biodegradable gel made from #carboxymethyl #cellulose that protects #nematodes and keeps them hydrated. The study is published in the journal #PNAS #Nexus.


phys.org/news/2024-04-nematode…


#Afrika #Afrique #Africa #افريقيا

2023-04-30

Life and death on the underside of a nettle leaf: foreground left an #aphid gives birth to a live nymph. Behind her is a #fly recently killed by an #entomopathogenic #fungus, probably #Entomophthora muscae. The posture of the fly is typical for one killed by this fungus: on the underside of the leaf, abdomen stuck out, wings forwards. This is all #BehaviouralModification by the fungus to enhance the spread of the sticky infectious spores that are being released from the abdomen.

High-magnification photo of the underside of a nettle leaf. To the left a fat green aphid is giving birth to a pale nymph. Behind her is a dead fly attached to the leaf, its wings folded forward and its abdomen distended with fungal spores.

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