"My citrus plants were covered in scale - these nematodes are brilliant!" Mrs P from Ely

Search the site:

Green Gardener - the natural way to keep your garden looking good

Scale Insect Control - Scale is difficult to spot and can easliy increase unnoticed and will affect plants both underglass and outside. Underglass, scale is very partial to citrus. Outside, keep a close eye on Japenese acers, camellias, rhododendrons, azaleas and box.

Scale Nematodes - Control scale insect by spraying with Scale Nematodes. Scale Nematodes can be used INDOORS and OUTDOORS :-

  • Spray INDOOR plants (in conservatories and geenhouses) with scale nematodes ANYTIME scale is discovered and the temp is above 14c.
  • OUTDOOR plants can be treated outdoors when the temperature is above 14°c. Potted OUTDOOR plants can be treated outdoors when the temperature is above 14°c or they can be moved into a greenhouse or conservatory and treated ANYTIME scale is discovered and the temp is above 14c.

Scale Emergency Pest Pack

Emergency Scale Pest Pack£30.49Add Emergency Scale Pest Pack      
to your Shopping Basket

Emergency Scale Pest Pack - "Help, every plant is covered with scale. What should I do?"

Use our Emergency Scale Pest Pack containing 250ml of SB Invigorator (sent ASAP) followed 7-10 days later by a course of Scale Nematodes (3 intros at 21 day intervals).

  1. The SB Invigorator will be sent 1st.
  2. Spray with SB Invigorator at least TWICE in 7 days - spray more often if needed i.e. every other day.
  3. The 1st lot of Scale Nematodes will follow 7-10 days later with a further 2 more lots following at 3 week intervals.
  4. Spray the infected plants with the Scale Nematodes and repeat at 21 day intervals.

Emergency Scale Pest Pack £31.00

Scale Insect Control

Scale Nematodes - 3 intros. 21 days apart£17.50Add Scale Nematodes - 3 intros. 21 days apart      
to your Shopping Basket
SB Invigorator - 1 x 500ml Ready to use Spray£9.99Add SB Invigorator - 1 x 500ml Ready to use Spray      
to your Shopping Basket
SB Invigorator - 1 x 250ml Concentrate£13.50Add SB Invigorator - 1 x 250ml Concentrate      
to your Shopping Basket
SB Invigorator - 1 litre Super Concentrate£54.99Add SB Invigorator - 1 litre Super Concentrate      
to your Shopping Basket

Scale Insect Control - Scale insect is difficult to spot, so look out for the symptoms of an attack i.e. sticky lower leaves, sooty mould and yellowing of top leaves. Underglass, scale is very particular to all types of citrus. Outside, keep a close watch on camelias, rhododendrons, azaleas and box. There are a number of different species of scale, although they are all similar in appearance. They are unlike any other pest as they don't look alive at all. Control scale insects by spraying with Scale Nematodes AS SOON as you see scale and the temp is 14C/58F

Scale Insect - They are motionless and are stuck firmly to the stem and the underside of leaves (often around the veins) from which they suck the sap. They are dome shaped, about 0.6cm fully grown, light brown when young but gradually darken as they mature. They feed on the sap of the plant, leading to a yellowing of the leaves and in extreme cases total defoliation. Scale insects produce large quantities of honey dew which drips onto the lower leaves. Initially clear and sticky, it is then colonized by sooty mould (pictured left), which is unsightly and reduces the ability of the plant to produce food, leading to further weakness and loss of vigor. This mould and honeydew are the first signs of an attack. A female scale insect produces a mass of eggs i.e. between 500 and 2000! and then dies. The eggs are laid under the scale which protects them as they develop. The eggs hatch to produce a crawler stage which settles on a suitable part of the plant, starts to feed and becomes immobile. The length of the life cycle depends on temperature but at 20°c it normally takes 10 weeks from egg to adult.


Controlling Scale Insect - Control Scale Insect UNDERGLASS & OUTDOORS by spraying with Scale Nematodes AS SOON as you see scale and the temp is 14C/58F. Spray with SB Invigorator if scale is present in large numbers or the temperature is below 14C. Once the temp is correct, spray infected plants with scale nematodes.

  • Controlling scale in your greenhouse or conservatory - spray your plants with scale nematodes at anytime as long as the temp is 14c.
  • Controlling scale outdoors - Permanent outdoors plants should be treated when the temperature is above 14C i.e. noprmally between April and September. Potted outdoor plants can be moved into a greenhouse or conservatory and treated at anytime.

"For the past four/five years I have suffered an infestation of scale insects on my grape vine (under cover). The Nematodes have work great, completely free of them. I suggest that you let it be known that they work on grape vine and not just plants." Dave Keithley in 2015

"Further to  the above Scale Nematodes I ordered last year, just to inform you that my grape vine is still free from scale insects." new from Dave Keithley in 2016


Controlling Scale Insect - There are three steps to treating for scale :-

  1. Mix the nematodes with water and spray the infected plants, concentrating on the undersides of the leaves and stems.
  2. Keep the foliage moist for 12 hours. This can be achieved by damping down the leaves with a gentle soft water spray, being careful not to wash the nematodes off, or by covering the plant with polythene (put the plant in a bin bag if small enough) for 12 hours following treatment.
  3. The whole process is repeated 3 times at 21 day intervals. Our price includes 3 introductions sent by 1st class post at 21 day intervals.

N.B. Please note that once the scale insects are killed, they will remain on the plant, which will often lead people to believe that the control is not working. The first indication that the control is working is that honeydew will stop being produced so if the mould is washed off - SB Invigorator is very good at doing this - it will not come back. The scale itself can be removed by hand. 

SB Invigorator - Use SB Invigorator spray to control scale if the tempertaure is below 10C/50F and then spray with the nematodes. SB Invigorator should also use it for a pest emergency - been away or not noticed a rapid build up of scale - use SB Invigorator to get control BEFORE spraying with nematodes.


SB Invigorator - Controls scale and used regularly will reduce fungal diseases such as mildew PLUS it contains a foliar feed to help plants recover from pest attack. SB Invigorator is not only highly effective, but it is also biodegradable and non -toxic ,which means it can be used in the garden, conservatory or in the greenhouse and on edible plants too - pick and eat straightway. It is suitable for use throughout the year. SB Invigorator is brilliant at clearing heavy infestations BEFORE introducing a natural control - see our Emergency Pest Pack below.

SB Invigorator is available as a 500ml ready to use spray, as a 250ml concentrate (makes 25 litres of spray) or as a 1 litre super concentrate (makes 500 litres) for use in your own sprayer.

"The plant invigorator spray is working beautifully on the aphids in the back garden and it is a pleasure to be able to spray something effective ,but based only on plant oils." Jacob by email.