We think that a little education on this subject is over-due.
What are they?
Vine weevil are a native woodland species that loves to munch on young fibrous roots whilst it is in its larvae stage. It then grows into a ‘robotic walking’ weevil which likes to eat semi-circular chunks from the leaves of many adult plants. They are a real pain, difficult to control as they can only be effectively treated with insecticides or natural predators at the larvae stage. When developed into weevils they are cunning in their hiding places, resistant to a lot of insecticides, non-appetizing to wildlife and able to cover great distances in their pursuit of food.
Why do we not have many problems with them?
Commercially for a number of years the trade has used a vine weevil deterrent chemical in our composts. This ensures a period of breathing space so that our young plants can establish their roots without something gobbling them. This is why we ‘very rarely’ have any problems with the larvae. However we, like you, cannot defend against the weevil attacks on foliage and being surrounded by gardens and woodland, we cannot eradicate them from our nursery completely.
Vine weevil eggs are very…very small, less than 1mm and are not easy to see with the naked eye. What people have normally noticed in their compost is Osmocote. This is a commercially used and publically available slow release fertilizer. Hard, orangey-brownish yellow pellets contain the fertilizer and when these become moist, they swell slightly and become translucent yellowish green in colour. The moisture, coupled with correct ambient temperature, allows the pellets to release fertilizer at a controlled rate throughout the growing season. It is applied using two different methods. Individual pellets are mixed within the compost mixture or when low nutrient composts are reaching the end of their fertilizing stage, tablets (lots of pellets glued together) can be pushed into the compost near the surface. Many customers in the past have complained about their plants dying and then go on to reveal that they have rummaged through the compost, disturbing the root system, to remove the ‘vine weevil or slug eggs’ that were in the pot with the plant. Of course root disturbance of this degree will often result in a dead plant.
How to treat if you do find some.
There are two main methods for treating vine weevil at grub stage. You can buy a liquid insecticide designed to drench the soils in containers which will need to be applied once the weather warms up during the spring & possibly once or twice more during the summer. There are also natural nematode applications which are microscopic predators of the vine weevil. They are applied in dilution to the soil of pots or gardens & then they actively prey on vine weevil grubs. Once they have done their job, they perish, so annual application is necessary. There is another method, but it usually comes too late after most of the damage has been done to root systems. Manually pick off & crush the adult beetles. This will at least help prevent them from mating & producing new eggs for the next generation. Unfortunately the adults tend to be more active from dusk onwards making them extremely difficult to spot.
We hope that this information will prove helpful in re-assuring you that we are not in the habit of knowingly spreading nasty little troublesome insects among our customers.
Lily beetle and its larvae are leaf-eating insects of lilies and fritillaries. The adult beetles are very occasionally found on other plants but lilies and fritillaries are the only plants on which eggs are laid and the grubs develop. Apart from spoiling the plants’ appearance, attacks in early summer can result in undersized bulbs developing, which may not flower next year. Lily beetle has become widespread in the UK over the past three decades.
Gardeners should look out for; Adult beetles which are 8mm long and have bright red wing cases and thorax. The head and legs are black Clusters of orange-red, sausage-shaped eggs on the undersides of leaves Larvae which reach 6-8mm long and are rotund, reddish brown with black heads. They are usually completely hidden under their own wet black excrement Young grubs graze away the underside of leaves, resulting in white or brown dried up patches. The older grubs eat entire leaves, starting at the tips and working back to the stem, they will also feed on petals, stem and seed pods Adult beetles make rounded holes in the leaves and will also feed on petals and seed pods
Non chemical control
Where only a few lilies and fritillaries are being grown, the plants should be regularly inspected from late March onwards so that adult beetles, larvae and eggs can be removed by hand.
Pesticides are likely to be more effective on larvae than adults Heavy infestations which are impractical to remove by hand can be treated with pesticides Organic insecticides containing natural pyrethrins (e.g. Bug Clear Gun for Fruit or Defenders Bug Killer, ecofective Bug Killer (also contains fatty acids)). Several application of these short persistence products may be necessary to give good control Synthetic pyrethroid pesticides such as lambda-cyhalothrin (e.g. Westland Resolva Bug Killer), or deltamethrin (e.g. Sprayday Greenfly Killer) can be used The systemic neonicotinoid insecticide acetamiprid (e.g. Bug Clear Ultra) can also be used Plants in flower should not be sprayed due to the danger to pollinating insects.
Red lily beetle overwinters as adult beetles in soil, leaf litter and other sheltered places. This could be anywhere, not necessarily in the vicinity of lilies and fritillaries. Consequently, there is no advantage in attempting to treat the soil below lily plants. The beetles begin emerging on sunny days in late March and April when they seek out the foliage of host plants. Eggs are laid in small batches on the underside of leaves during April to mid-summer. The eggs hatch and the larvae feed on the foliage. When fully fed, the larvae go into the soil to pupate. The next generation of adult beetles emerges from mid-summer onwards. These beetles add to the feeding damage but there is only one generation a year and these late summer adults will not mate and lay eggs until the following year.
Information freely available on RHS website :https://www.rhs.org.uk/advice/profile?pid=553
Box tree caterpillars feed within webbing and can completely defoliate box plants. It is a relatively new insect to Britain. Whilst the adult moth was first reported in the UK in 2008, caterpillars were not found in private gardens until 2011, it has since become widespread in London and surrounding areas.
Common name Box tree caterpillar Scientific name Cydalima perspectalis Plants affected Box (Buxus) Main symptoms Foliage is eaten and covered in webbing Most active April-October
What is box tree caterpillar?
Box tree caterpillars are the larvae of a moth that feeds on box (Buxus) plants. It is native to East Asia and it became established in Europe in 2007. Although adult moths were first found in the UK in light traps in 2008, it was not until 2011 that larvae were reported in private gardens in the home counties. By the end of 2014 the moth had become established in parts of London and surrounding counties; in many cases the caterpillars had caused severe defoliation indicating that the moth is likely to become a serious problem.
Gardeners are likely to become aware of box tree caterpillar when they find webbing and caterpillars on box plants. The pale yellow flattish eggs are laid sheet-like, overlapping each other on the underside of box leaves Newly hatched caterpillars are greenish-yellow, with black heads. Older caterpillars reach up to 4cm (1¼in) in length and have a greenish/yellow body with thick black and thin white stripes along the length of the body The pupae are concealed in a cocoon of white webbing spun among leaves and twigs The adult moth usually has white wings with a faintly iridescent brown border, although the wings can be completely brown or clear. The moth has a wingspan of around 4cm (1¼in) The caterpillars eat box leaves and produce webbing over their feeding area. Plants may also show patches of dieback which may be especially apparent on trimmed plants. This is not to be confused with dieback caused by the disease known as box blight.
Non chemical control
Where practical, caterpillars should be removed by hand A pheromone trap which can help monitor adult moth activity is available from several suppliers including Agralan The mixed nematode biological control sold as Fruit and Vegetable Protection may have some effect on the larvae
Extensive infestations can be treated with an insecticide. Thorough spray coverage is required if control is to be achieved Forceful spraying is needed to penetrate silk webbing The contact pyrethroid insecticides pyrethrum (considered organic e.g. Bug Clear Gun for Fruit and Veg or Defenders Bug Killer,), deltamethrin (e.g. Provado Ultimate Fruit & Vegetable Bug Killer, Sprayday Greenfly Killer), lambda-cyhalothrin (e.g. Westland Resolva Bug Killer) may have some effect. The systemic neonicotinoid insecticide acetamiprid (e.g. Bug Clear Ultra) can also be used Plants in flower should not be sprayed due to the danger to pollinating insects
Choose alternatives to box
Where it has become impractical to control box tree caterpillar an alternative hedge or topiary plant can be used. Ongoing trials of a variety of compact, evergreen shrubs at RHS Garden, Wisley are showing promise as alternatives. The following all have small leaves and can be clipped into formal hedging styles:
Berberis darwinii ‘Compacta’, Berberis thunbergii ‘Atropurpurea Nana’, Euonymus fortunei (various cultivars), Ilex crenata (Various cultivars), Lonicera nitida ‘Maigrün’, L. nitida ‘Baggesen’s Gold’, Luma apiculata ‘Glanleam Gold’, Osmanthus delavayi, Pittosporum ‘Arundel Green’, P. ‘Collaig Silver’, P. ‘Oliver Twist’, P. tenuifolium ‘Golf Ball’, Rhododendron Bloombux, Ugni molinae,U. molinae ‘Butterball’.
The biology of the box tree caterpillar in the UK is not yet fully known, as it is relatively recent here, but it may have two or three generations per year. It overwinters as small caterpillars, hidden between box leaves that have been spun together with silk in autumn, and completes its development in spring. The adult moth is capable of flight, but it is not known how far it can travel.
Information freely available on RHS website https://www.rhs.org.uk/advice/profile?PID=760
Garden retail like it used to be.
Here at Clockhouse Nursery we pride ourselves in providing reasonably priced plants & the products you need to grow them effectively.
That is all.
So, no need to wade through the tide of unnecessary paraphernalia that you will find in most modern garden centres.
No need to worry about parking either as we have over 150 spaces available.
Not many Garden Centres can boast over ninety years of history, and yes, we have seen many changes over that period. Indeed change will continue as we strive always to supply the best in plants and facilities. One thing, however, will never change:
The core philosophy first introduced by Archibald John Mills way back in 1928 remains - the philosophy that built the company’s reputation, sustains it now, and will guide it in the future:
The best way to keep gardeners happy is to offer them plants of the highest quality, sold at reasonable prices.Read more