Mites and Scale on Almond

31 Pages·2015·1.68 MB·English

Mites and Scale on Almond:
Symptoms and Management
Kris E. Tollerup, UC Area Advisor, Kearney Agricultural
Research and Extension Center

Monitoring
• Critical component of management
– Identification of pest and associated damage.
– Estimate population density of pest
• Provides decision-making tool.
– Some level of pest/damage is tolerated i.e. below on
economic injury level
• Pest and crop dependent.
• Decrease as crop value increases/pesticides decrease.
Spider Mites
• T etranychus spp.
– Pacific spider mite
• T. pacificus.
– Twospotted spider mite
• T. urticae.
– Strawberry spider mite
• T. turkestani.
Male Morphological
Characteristics
Spider Mites, Injury and Damage
• F eed using a stylophore
– Punctures cells, mite sucks out
content causing stippling.
– Browning of leaves.
– Defoliation
• MAY: reduce fruit quality following
year due to Reduced photosynthesis
• Sunburn of wood.
– Plant stress due to
evapotranspiration.

Management, Natural Enemies
• Predatory mites

– Galendromus sp.
– Neoseiulus spp.
• Lacewing
– Chrysoperla spp.
• Sixspotted thrips
– Scolothirps sp.
• Spider mite destroyer
– Stethorus spp.
Management, Natural Enemies
Type 4 Type 3 Type 2
Euseius stipulatus Galendromus occidentalis
Metaseiulus citri
Euseius tularensis Typhlodromus caudiglans Neoseiulus californicus
Predatory Mite Food Type
Type 4 Type 3 Type 2
Mites + insects + Mites + insects + Web-spinning
pollen + leaf sap pollen spider mites

Euseius Amblyseius Galendromus
quetzali similoides occidentalis
Euseius Metaseiulus Neoseiulus
stipulatus citri barkeri?

Euseius Typhlodromus Neoseiulus
tularensis caudiglans californicus