Allowed in Organic farming
Amblyseius californicus

Amblyseius californicus

Acaro fitoseide, predatore di tetranichidi

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Amblyseius (Neoseiulus) californicus is a phytoseoid mite with a general diet regimen: the preferred prey are tetranichid mites (Tetranychus urticae, Panonychus ulmi, etc.), but it also feeds on tarsonemidi mites (Steneotarsonemus pallidus, Polyphagotarsonemus latus), Tenuipalpid mites (Brevipalpus spp.) and even small insects (thrips). It is also able to survive in the absence of prey, feeding on pollen.

DESCRIPTION OF THE SPECIES

The mobile stages have a piriform body, of a transparent white-orange to yellow color. Males are smaller, darker in color and generally less numerous than females. The eggs are oblong, larger than the eggs of tetranichids and have a transparent to white-pearl color. They are laid on the lower page of the leaves, often attached to the hair along the ribs.

BIOLOGY AND BEHAVIOR

The development cycle of A. californicus takes place through the stages of egg, larva, hexapoda, protoninfa, deutoninfa and adult. The average duration of egg-adult development decreases with increasing temperature, from about 22 days to 13 ° C to less than 4 to 33 ° C. The rate of oviposition of A. californicus is among the highest known and is comparable to those reported for Phytoseiulus persimilis. At 29 ° C the maximum total oviposition values ​​are found with an average of about 67 eggs and an average daily deposition of about 4 eggs. In laboratory tests it was observed that A. californicus is able to adjust its fecundity and the number of specimens predated to the density of the plant. Pollen is only a survival diet, but it is useful for the maintenance of phytoses on the crop when the prey is poor. In the absence of food, the predators scatter around the crop and on the ground looking for new prey, but most of them remain inside the crop waiting for their prey.

TARGET ORGANISMS

Mites tetranichids (Tetranychus urticae, Panonychus ulmi, Tetranychus cinnabarinus). Collateral action towards other phytophagous mites (Steneotarsonemus pallidus, Polyphagotarsonemus latus, Brevipalpus spp.).

SECTOR OF EMPLOYMENT

Ortive crops mainly in greenhouses but also in open fields: cucumber, watermelon, strawberry (both in the greenhouse and in the open field), aubergine, melon, pepper.

Amblyseius californicus controlla:

  • acari tetranichidi
  • acari tarsonemidi
  • acari tenuipalpidi
  • tripidi

Il tasso di ovideposizione di A. californicus è tra i più alti noti ed è comparabile a quelli riportati per Phytoseiulus persimilis. A 29°C si riscontrano i massimi valori di ovideposizione totale con una media di circa 67 uova ed una deposizione media giornaliera di circa 4 uova. 


In prove di laboratorio è stato osservato che A. californicus è in grado di adeguare la propria fecondità e il numero degli esemplari predati alla densità del fitofago. Il polline costituisce solo una dieta di sopravvivenza, ma è utile al mantenimento del fitoseide sulla coltura quando la preda è scarsa. 


In assenza di cibo i predatori si disperdono intorno alla coltura e sul terreno alla ricerca di nuove prede ma la maggior parte di essi rimane all’interno della coltura in attesa delle prede.    

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