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Oamenii de știință descoperă ce îi sperie pe ploșnițele de pat

01 Mar 2026
2 minute min
Maria Popescu

De fapt, ploșnițele de pat nu iubesc deloc să se ude. Cercetătorii de la UC-Riverside raportează că aceste dăunătoare domestice evită în mod accentuat suprafețele umede, o descoperire care a apărut accidental atunci când un dispozitiv de hrănire din laborator a scurs sânge într-un biberon cu ploșnițe de pat — iar insectele au refuzat să se apropie de hârtia umezită de la partea de sus a recipientului, conform newser.com.

👉 Comportamentul ploșnițelor față de umezeală în laborator

„Am crezut că ploșnițele de pat vor fi fericite să bea sângele de pe hârtie”, spune coautorul studiului, Dong-Hwan Choe, într-o declarație. „Dar ceea ce am văzut a fost foarte diferit.” Experimentele de urmărire cu apă pură au arătat același model: Insectele au petrecut mult mai puțin timp pe zonele umede, iar aproape 90% din timp au schimbat direcția înainte de a contacta chiar umiditatea. Ploșnițele mai tinere, numite „nymphs”, au fost cu aproximativ 60% mai rapide decât adulții în a evita umezelile, sugerează o sensibilitate deosebit de acută.

O echipă de cercetare suspectează că apa este periculoasă pentru aceste insecte, deoarece corpurile lor plate și deschiderile respiratorii mici ar putea fi rapid copleșite de lichid. Studiul, publicat în Journal of Ethology, sugerează că profesioniștii în controlul dăunătorilor ar trebui să reconsidere modul în care utilizează insecticidele lichide. Dacă produsele chimice nu ucid la contact, ploșnițele ar putea pur și simplu să fugă de suprafețele umede tratate și să se răspândească în alte locuri.

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