Tag Archives: grass_grubs

Pestie Pests in the garden (Wally Richards)

Insects that eat, or feed off, our garden plants we call them pest insects but they are just part of the Natural World we live in and if there were no pest insects then that would also be the end of the beneficial insects that live by eating the ones we call pests.

Unfortunately there is usually far more pests than beneficial insects so we have to use control methods to keep the pest’s numbers down.

As I have said many times before the pests and diseases that affect our garden plants are actually Nature’s Cleaners, it is their job to take out the weak plants.

By doing so they aid in the demise of the sickly plants and as the remains compost down to feed and make room for the healthy plants.

So if we force plants to grow as they do commercially then those plants will be attacked by pests and diseases which the grower will use any number of chemical sprays to prevent their crop from being damaged and unsalable.

Which in fact only makes matters worse as the plants will now be weak and sickly from all the chemicals they have been exposed to.

Some times we are at fault by providing a massive food source for pests which allows them to rapidly increase their numbers and a bigger problem for us gardeners or growers.

For instance we plant a row of cabbages and to the butterflies that’s food bonanza, heaps of foliage to sustain all the caterpillars that will hatch out of the eggs they lay.

But say one cabbage is growing in a field of lots of different plants them Mrs Butterfly is going to have a problem finding it and if she does it will only support a few caterpillars to maturity.

In New Zealand we have a Native pest called the grass grub which is the larva of the bronze beetle.

Before New Zealand was settled by the colonialists the grass grubs/beetles fed on the  sparse growing native grasses and a few other plants.

Not a lot of food source and so not a lot of grass grubs which were also a welcome morsel for the many Kiwis that foraged at night.

Then settlers cleared the bush and planted grass; hectares of grass and what a win fall for the grass grub beetles and this their populations grew to the millions of them that we have these days, every year.

Temperature is a big factor for many pest insects and when the temperatures are warm they can rapidly bred.

When we have a early spring with a week or two of early nice warm days and nights then the pests that have been waiting for those conditions come out to play and lay.

Then if we are hit with a cold snap for a week or so many of these early risers will be killed along with vulnerable eggs they laid.

When that weather pattern happens then it is not until January/February that we see their populations rise and become troublesome.

Otherwise we have problem populations happening by November/December.

So the key for good control of pests such as whitefly, leaf hoppers, aphids etc is to start control methods at the first sign of any pest.

Too often we also miss controlling pests early because they are on weeds or plants we are not concerned about or they are over the fence; as the neighbor maybe is not a keen gardener and then they have a breeding jungle of plants/weeds.

When they are over the fence those pests will keep coming over to your plants the whole season and unless you ask the neighbor if you can tidy up and clean up their patch you have a yearly problem which will require constant controls till winter.

Sprays of Wallys Super Neem Tree Oil with Wallys Super Pyrethrum applied to your plants just before dark. Spraying under and over the foliage.

Repeated every few days if you have a bad infestation and then weekly to fortnightly to maintain control.

Placing Neem Tree Granules or powder on the soil or growing medium helps a lot as it creates a smell which helps disguise the smell of the plants making it more difficult for pests to find their host plants.

A electric Insect Zapper that attracts night flying moths and beetles to the UV light for them to zapped on the high static electricity grid will also reduce you problems greatly.

Do a Google search and find a unit for about $40.00. One thing to remember they are often 230v plug in so you need to be sheltered from weather where you are playing with electricity.

Wallys Yellow sticky white fly traps are also a g reat way to reduce the adult flying insect pests.

Then we have the pests that are not so noticeable such as Mealy bugs.

These white pests are like a small bit of cotton wool as seen on your plants and in particular container plants.

The adults are what you see sucking on the stems and leaves of plants and are easy to control with a spray of Wallys Super Pyrethrum but low and behold within next to no time they are back on the plant. Why? Cause the young live in the roots of the plant also sucking goodness from the plant’s roots. They come up stairs later on which is when we see them..

So to control them in the root zone a sprinkling of Wallys Neem Tree Powder over the growing medium but not against the trunk.

It is best to give a watering over the powder then cover with some potting mix as it will go moldy as it breaks down and it does not look good.

Covered you wont see the mold.

Also making up a solution of Wallys Super Neem Tree Oil in warm water and watering that over the surface of the mix in the container maybe a better option and repeat that a few times till no more down stairs comes up stairs.

Root Nematodes are another pest we don’t see in the roots of plants but they can be there without your knowledge, even in your lawn grasses roots.

You can test for that in the lawn by applying Wallys Neem Tree Powder to a area of the lawn and watering in.

If after a few weeks that areas grasses look better than the rest of the lawn, then yes you had root nematodes and so it would pay to treat the rest of the lawn.

Wallys Neem Tree Granules sprinkled over the soil in your gardens and in particular under your citrus trees can improve the health and vigor of your plants by the control of the pests.

Phone 0800 466464
Garden Pages and News at www.gardenews.co.nz
Shar Pei pages at  www.sharpei.co.nz
Mail Order products at www.0800466464.co.nz


New Zealand Bill of Rights Act 1990. Part II of the Act covers a broad range of Civil and Political Rights. As part of the right to life and the security of the person, the Act guarantees everyone:

1The right not to be deprived of life except in accordance with fundamental justice (Section 8)

2The right not to be subjected to torture or to cruel, degrading, or disproportionately severe treatment or punishment (Section 9)

3The right not to be subjected to medical or scientific experimentation without consent (Section 10)

4The right to refuse to undergo any medical treatment (Section 11)

 Furthermore, the New Zealand Bill of Rights Act 1990 guarantees everyone: Freedom of Thought, Conscience, and Religion.
This includes the right to freedom of thought, conscience, religion, and belief,
INCLUDING THE RIGHT TO ADOPT AND HOLD OPINIONS WITHOUT INTERFERENCE (Section 1)

Image by Alexa from Pixabay

GRASS GRUBS: NOW IS THE TIME (Wally Richards)

I am often asked is it the best time to do certain things in the garden and more often than not when asked it is not the best time. Gardeners sometimes miss the boat and only later when the damage is done or the plants are out of season, that they look for the solution.

When I had a garden centre I would have newby gardeners coming in during the spring looking for daffodil bulbs/plants, cause they saw them flowering in people’s gardens.

This also applied to tulips and other spring flowering bulbs. Now is the time to buy your spring bulbs and plant them.

Lawn problems caused by grass grubs are noticed in the spring when patches of lawn die.

Treatment then is a total waste of time and money because the grubs are in most cases deep below the surface in cocoons waiting for the right conditions to emerge as beetles.

Any treatment applied in the spring may catch a small amount of grubs and not worth the expense.

What has happened is way back in October through to about December (maybe January) the grass grub beetles were on the wing chewing up the foliage of your plants in the evening and laying up to 300 eggs per female back into your lawn or gardens.

As these eggs are laid deep in the soil and when the grubs emerge they start eating the roots of the grasses (or some other plants) this is way down about 200 mm under the soil. The grubs are small and the damage done is not great.

The grubs grow and keep working their way upwards as the roots are eaten out at the lower depths.

If the soil becomes dry during a summer drought, the grubs go into a semi dormant state waiting for the moisture to return.

This normally happens with the autumn rains and the grubs wake up and start feeding again getting closer and closer to the soil surface.

Now if we cut a square in the lawn with a spade about 50mm deep we are likely to find a number of the white grubs in the area we have lifted.

These grubs curl up when disturbed. Any greasy looking caterpillars found are the porina.

If you lift turf in different areas of the lawn you can see where the worst problems are in other words where the most grass grubs are.

These are likely to be found in areas where there has been past problems or in areas near where lights shine at night, because the beetles are attracted to lights in the early evening when they are in flight.

You may find that in some areas in the turf you lift there are either no grubs or only say under 6 per square foot. In other areas you may find lots of grubs in a square foot. Its those areas you should concentrate your efforts as that is where damage will occur and be noticed.

There are currently two non chemical treatments available.

The liquid one is Wallys 3 in 1 for Lawns.

The product consists of Eucalyptus oil and Tea Tree oil along with natural plant foods in the form of manures and seaweed/fish extracts.

Available in 1 litres containers which cover 50 square metres of lawn or gardens.

Follow the instructions for mixing with water and it is best applied to the lawn in a device called a Lawnboy.

After application the lawn is further lightly watered with the hose or a sprinkler to wash the oils off the grass and down into the top 6 to 10cm of the lawn. It is there that it does its job.

Often lawns are the home of garden slugs which emerge out of the soil and thatch to invade our gardens during moist times. The product knocks them out also.

Worms will happily live underneath the oil layer in the top soil without any known adverse effects.

Worms that are near the surface when applied may not fair so well.

This means it is best to apply the product when the soil is moist but not after a good amount of rain which tends to bring worms to the surface.

I have found that these oils will control other soil insects such as eel worm, centipedes, root mealy bugs, porina etc.

Even the likes of earwigs and slaters can be given the old hurry on if they are causing problems.

The manufacturer informed me that the oils act as an irritant to the pests and they succumb as a result.

Imaginative gardeners may find this product an interesting tool in assisting in the control of some pests such as wire worm in the soil by treating the area a few weeks before planting (say) their new seasons potatoes.

The product is only recommended for lawn use and ideally should only be used for the control of pests in the lawn areas.

Used for any other purpose is not recommended but being two natural oils I cannot see any health concerns as you are not likely to spray over any food crops and eat them without first washing as normal.

Being a oil based product, it can of course burn foliage and grass if applied in sunlight.

For lawn applications it is recommended to use early in the morning or late afternoon and washing in with the hose, the oils off the foliage and into the soil.

Safe for your children and pets unlike the previous mention products.

The other natural product is Wallys Neem Tree Powder.

I suggest powder as it is less easy picked up when mowing the lawn.

Once again after you have done your spade tests on where the most grass grubs are then you really only need to treat those areas.

Spread the powder at 50 to 100 grams per square metre onto a recently mowed lawn and when the soil is moist.

Lightly water to settle the powder off the grasses and get it down to the soil surface.

If you have a roller or can hire one then roll the areas treated to press the powder into the soil.

It will breakdown and release the Neem properties which will be taken up by the roots of the grasses.

Thus when Mr Grass Grub takes a bite of the root he gets some Neem into his gut and it turns off his ability to eat any more. Thus he starves to death.

Most effective and safe for children, pets and soil life.

Now is the time to treat Grass Grubs

If your lawn problem just involves porina caterpillars then the most effective and less expensive treatment is applications of Wallys Super Neem Tree Oil applied late in the day on a freshly mowed lawn.

You should use a lawnboy to drench the grasses at the rate of 5 mls of Wallys Super Neem Oil per Litre of water or a boom spray nozzle on your back pack sprayer.

You are looking to get a coating of the Neem Oil to the base of the grasses where the porina is going to feed that night. Once they get some Neem in their gut they will stop eating and starve to death.

Treatment for porina can be done anytime of the year as they are a all year round pest.

FOOT NOTE:

Each week along with the gardening article I am going to make a product on a special price for you, for one week only.

The special will end the following Sunday when I dispatch the new article.

This week it will be  Wallys Neem Tree Powder 1kilo Normally $15.00 this week only $10.00

Also Wallys Neem Tree Powder 3 kilo bag Normally $28.00 This week only $20.00

Order on the Mail Order Web site at www.0800466464.co.nz  (any problems registering then phone me)

In the comment place please put the words NEEM SPECIAL so I know to deduct the special off you order before I phone you to arrange payment and any freight costs.

Remember Freight is free  in North Island for Orders of $100 or more (excluding bulk items) South Island it is orders of $150.00 or more for free shipping. (excluding bulk items)


Phone 0800 466464
Garden Pages and News at www.gardenews.co.nz
Shar Pei pages at  www.sharpei.co.nz
Mail Order products at www.0800466464.co.nz


New Zealand Bill of Rights Act 1990. Part II of the Act covers a broad range of Civil and Political Rights. As part of the right to life and the security of the person, the Act guarantees everyone:

1The right not to be deprived of life except in accordance with fundamental justice (Section 8)

2The right not to be subjected to torture or to cruel, degrading, or disproportionately severe treatment or punishment (Section 9)

3The right not to be subjected to medical or scientific experimentation without consent (Section 10)

4The right to refuse to undergo any medical treatment (Section 11)

 Furthermore, the New Zealand Bill of Rights Act 1990 guarantees everyone: Freedom of Thought, Conscience, and Religion.
This includes the right to freedom of thought, conscience, religion, and belief,
INCLUDING THE RIGHT TO ADOPT AND HOLD OPINIONS WITHOUT INTERFERENCE (Section 1)