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San José scale

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San José scale

Insect — Hemiptera Confirmed pest

What is an opportunist?

An "opportunist" is a population (fungi, bacteria, insects…) that takes advantage of a favourable environment to settle in, multiply and feed on it. It often develops when the natural defences of the affected organism are weakened — for genetic reasons or linked to context (water stress, deficiencies, nutritional imbalances, overcrowding…). This is typically the case in monocultures, where a single host plant, uniform and present in large numbers, offers ideal ground for it to spread.

Identification key : Scale insects and mealybugs (Adult (and nymphs resembling the adult))

Scientific name : Comstockaspis perniciosa (also Quadraspidiotus perniciosus)

Other names : San Jose scale

San Jose scale (Comstockaspis perniciosa, formerly Quadraspidiotus perniciosus) is a tiny, grey, round armoured scale that lives attached to bark, leaves and fruit. Females give birth to mobile crawlers that spread and then settle to suck sap, with several generations per year. Fruit shows red spots around each scale, and infested branches weaken and may die back; it mainly affects apple, pear, peach and plum.

Crops affected : Almond tree, Apple tree, Hazelnut tree, Peach tree, Pear tree, Plum tree, Walnut tree

Source : Comstockaspis perniciosa (QUADPE)[Overview] — EPPO Global Database — EPPO Global Database

This page lists the bio-preparations in the collection that other references associate with this opportunist: San José scale.

Warning: the associations between recipes and opportunists come from other references (traditional practices, publications, user feedback). They are neither a recommendation nor a claim of effectiveness. There is no certainty regarding the preparation, application and use of these bio-preparations. See the regulations

Associated bio-preparations

Neem leaf brew

✅ Authorised in some countries Bio-inputs in BurundiBio-inputs in ColombiaBio-inputs in Costa RicaBio-inputs in IndiaBio-inputs in KenyaBio-inputs in South KoreaBio-inputs in PeruBio-inputs in the PhilippinesBio-inputs in RwandaBio-inputs in TanzaniaBio-inputs in UgandaBio-inputs in South SudanBio-inputs in the Congo - KinshasaBio-inputs in Somalia

See also · Crops

Almond tree Hazelnut tree Plum tree Peach tree Apple tree Walnut tree Pear tree

Ingredients used

Water Fresh neem leaves

Opportunists of the same crops

Brown marmorated stink bug Stolbur (bois noir) Brown rot (Monilinia) Oriental fruit moth Xylella fastidiosa Codling moth Pink hibiscus mealybug Mediterranean fruit fly Bacterial diseases Sharka (plum pox) Aphid Verticillium wilt

← Referenced opportunists

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