Spitting spider

Scytodes thoracica, commonly known as the spitting spider, belongs to the family Scytodidae within the order Araneae. It is crucial to note that this species is not a plant pest; instead, it acts as an active predatory entomophage. In an agronomic context, its presence in greenhouses or agricultural fields should be viewed as a positive factor that contributes to the natural regulation of insect pest populations.

The biology of this species is unique due to its specialized hunting method. The spider does not build classic webs; instead, it slowly approaches its prey before "spitting" streams of sticky silk from its chelicerae. This secretion, mixed with venom, instantly immobilizes the victim, allowing the spider to deliver a fatal bite. Its life cycle includes egg, larval, and adult stages, with a preference for warm, sheltered microhabitats.

Since Scytodes thoracica feeds on small insects, it does not damage crops. The perception of it as a "pest" is a misconception arising from accidental sightings on foliage. On the contrary, in greenhouses or storage facilities, it can help control populations of small dipterans, lepidopterans, and other arthropods that threaten agricultural produce.

Its interaction with the agroecosystem involves suppressing potential pest numbers. It causes no mechanical damage to plant tissues, does not feed on sap, and does not transmit phytopathogens. The use of chemical pesticides against this species is inefficient and economically counterproductive, as it destroys natural biological control agents.

Protection measures regarding this species involve maintaining its population as part of an integrated pest management (IPM) system. Recommended practices include:

• Restricting the use of broad-spectrum insecticides during periods of low pest activity.
• Creating favorable conditions for entomophages in field borders.
• Conducting regular monitoring to differentiate between beneficial predators and actual pests before applying treatments.