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Biological Control of Two-Spotted Spider Mites

Biological Control of Two-Spotted Spider Mites

Strawberries are a most loved product of numerous families in South Carolina. Consistently, many home cultivators develop strawberries in their nurseries or in holders. While a few nuisance strawberry plants, the two-spotted insect bug (Tetranychus urticae Koch) is the bug that causes the most harm and is the most hard to control. Two-spotted arachnid parasites (TSSM) feed and live on the underside of leaves, making control of this vermin troublesome. They recreate rapidly in warm temperatures. On account of these attributes, great control of TSSM can be hard for home plant specialists. 

Business miticides that are successful in TSSM control are not accessible for property holder use. Items that are accessible to property holders may not be extremely compelling. 


A grown-up TSSM has a light green body with two dull spots on its back, subsequently the name “two-spotted”. TSSM are little in size (around 1/60 of an inch) making them hard to see with the unaided eye. The female TSSM is bigger than the male. If you are tired of spiders in your house or garden then spider pest control may help you to get rid of spider mites.

TSSM with a light green tone are “dynamic” (taking care of and laying eggs). During winter, females change tone to a ruddy orange. TSSM with a rosy orange tone are “torpid” and are not taking care of or laying eggs 

Impacts of Temperature on Spider Mites 

Bug vermin lean toward hot and dry conditions. They are generally dynamic between 48 °F and 111 °F; in any case, they lean toward temperatures between 55 °F and 98 °F. TSSM taking care of and propagation relies upon internal heat level, and the internal heat level of the bug relies upon air temperature. 

Females can lay up to 100 eggs in a normal lifetime of 68 days. Contingent upon day and evening temperatures, TSSM eggs will bring forth between 3-19 days. At temperatures under 48 °F, an arachnid bug egg will incubate in around 19 days. At temperatures over 70 °F, insect bug eggs will incubate in 3-7 days. 

TSSM experiences four phases of improvement from egg to grown-up. Arachnid vermin eggs are round and clear. They are laid on the undersides of leaves. The previously set of eggs is commonly laid on the least leaves on the plant. At the point when an insect bug egg hatches, it delivers a youthful creepy crawly bug that begins to take care of right away. 


The two grown-ups and youthful feed on the underside of the plant leaf. TSSM feed by sucking plant juice. Side effects of plants influenced by TSSM are: 

  • Hindered development 
  • Yellow mottling of leaves 
  • Little and deformed natural products 
  • Tanning of leaf underside (with serious taking care of) 

Natural Control 

Natural control of TSSM offers mortgage holders the most ideal choice and most secure approach to control this nuisance. Organic control is alright for the mortgage holder, pets and the climate. The greater part of the miticides utilized in business strawberry creation are not accessible for use by property holders. 

Savage Mites: Two types of ruthless bugs that are compelling in controlling TSSM on strawberries are Phytoseiulus persimilis and Neoseiulus californicus. 

Delivering these savage bug species will give the property holder season-long control of TSSM. Different harvests in the nursery will likewise profit by the arrival of the ruthless bugs. Delivering savage bugs will likewise support and advance the populace develop of other useful bugs in the home nursery that feed on TSSM. 

Timing the arrival of savage vermin is significant for fruitful control of TSSM. Prior to requesting the ruthless vermin, the property holder must assess the strawberry plants for TSSM or their eggs. There must be TSSM for the savage vermin to eat whenever they are delivered. In the event that they don’t have a food source, the ruthless parasites will either pass on or relocate to different plants. 

Check the undersides of strawberry flyers for TSSM. Check the quantity of grown-ups, crawlers (recently brought forth immatures) and eggs present. On the off chance that you discover at least two grown-ups with eggs per flyer, request the ruthless parasites. The ruthless parasites will regularly show up multi weeks subsequent to submitting a request. Ruthless parasites ought to be delivered inside 4 hours subsequent to accepting them. Savage parasites can be kept as long as 24 hours in a cooler, yet should be delivered inside this time. 

On the off chance that the number of inhabitants in the TSSM is exceptionally high, mortgage holders can apply a 1% green oil splash (Bonide All Seasons Spray Oil Concentrate, Ferti-lome Horticultural Oil Spray Concentrate, Monterey Horticultural Oil Concentrate, or Southern Ag Parafine Horticultural Oil) or an insecticidal cleanser shower (Bonide Insecticidal Soap Concentrate, Natural Guard Insecticidal Soap Concentrate, Garden Safe Insecticidal Soap Concentrate, Safer Brand Insect Killing Soap Concentrate, or Espoma Earth-tone Insecticidal Soap Concentrate) to help diminish the TSSM populace until the savage parasites show up.