Friday, July 29, 2016

Pests in your Garden?


     Yes Folks, unfortunately it is that time of year again. As our plants start to show successful growth and establishment, so do those nasty little bugs. They show up once they know that the plants are big enough to feed on. Since the previous post of pesty weeds, I thought it would be appropriate to talk about what bugs your plants as these pests are equally bothersome, perhaps even more!

     When going out to your garden, some of you may be saddened by the destruction of your plants. We spend so much time and money in growing them and want them to reach their full potential as worry free as can be. If your plants have had some insect and/or disease stress, your first initial reaction would likely be to get rid of them. You don't have to react so quickly as there are many solutions and growing alternatives to overcome this issue.

      It is true that in order to successfully eliminate these bugs and protect our vegetables, flowers, trees,shrubs,or wherever the issue may be in your garden, the first defense is through identification. When searching for these little culprits, remember that not all bugs are destructive. We refer to these bugs as "beneficial insects". Beneficial insects will eat and feed off of the nasty ones. Of course there are more destructive insects then there are beneficial types, however if you get rid of the bad ones, then the beneficial insects will increase in population. I have referenced the more common beneficial insects and what areas they benefit your garden. You will find them listed below along with photos which will make identification more accurate and easier. This class of insects also makes an ideal solution in dealing with pests as a biological means.  What this basically indicates is that instead of using chemicals you can promote beneficial populations to naturally occur by creating habitats as well as purchasing from your local Garden Centre or Agriculture Services.

     Growing types of plants that will attract beneficial insects is a great start to entice and increase the population. We have provided a list of those plants and you can find those by clicking here. I am sure most of you have heard that if you see many lady bugs then the aphid population will likely be lower.  Ladybugs or lady beetles enjoy eating aphids as well as other types of destructive insects. You can encourage the ladybug population with habitats such as a ladybug house or choosing not to spray any chemicals especially while these bugs are present. These houses and habitats are enticing for other beneficials such as the lacewing which will also help you gain control over aphids and other bothersome insects.

Pictured below are ladybugs at both young and adult stages to help in making a proper identification.

     Lady Beetle Nymp stage                                                                    Lady Beetle adult stage

      As mentioned, another popular beneficial insect is the Lacewing.  Lacewing insects will consume an array of destructive bugs similar to what Lady Beetles eat.  I'm sure you all have heard of mealy bugs and have had experiences with these that you want to forget. Encouraging the Lacewing population will help you solve this issue.

                                                       Adult Lacewing and Eggs
     Two other popular beneficial insects that are visibly seen are the Parasitic Wasp and the Praying Mantis. These insects are not as common as the Lady Beetle or Lacewing but can be seen in some regions. Both are pictured below to help you identify them when you are out in your garden.
Adult Praying Mantis

Parasitic Wasp

     Along with these beneficial insects mentioned comes another type called Beneficial Nematodes. Many gardeners are unaware of these types of beneficials that in particular are successful at controlling soil pest insects such as larvae or grubs. This method of control is becoming more widely known as insect and disease control methods have changed greatly over the past number of years.  Beneficial Nematodes are environmentally friendly, safe and effective as an alternative to using pesticides. Keep in mind that with any organic/biological control methods, reading directions on the label will still be required. You can purchase these Beneficial Nematodes at your local agriculture centre or nursery.

     Now for the not so fun part, but will be in the end, as you gain control over these guys.

     I'm sure you can identify the "big guy" pictured above...have you ever seen them this big before?  While out for a walk one morning I noticed that the sidewalk was just polluted with slugs and all were just as big as this one. They appear to be pretty resilient while inching their way across the rough surface below. Is it any wonder your peas, beans or other veggies and flowers have been completely stripped of their foliage? You can generally tell when slugs are present in your garden as they leave a shiny, sticky clear trail behind. Your garden can quickly be here today and gone tomorrow if these opportunistic guys get a chance to do their thing. Please don't give up hope because there are many alternatives for control over slugs. Broadcast a product called Diatomaceous Earth on top of the soil around the baseline of your plants. Slugs will stay away as this product is very sharp for them to crawl across. Some gardeners use Slug Traps that are also successful in reducing the damage that slugs bring to your plants.These are a few of many types of control methods when dealing with slugs.

     Don't be fooled by the bright red, shiny bug pictured below, as some gardeners may mistake it for a beneficial lady beetle. I can understand why this could happen as it does resemble lady bugs at first glance.

If this pest is left uncontrolled, it will completely defoliate and ultimately terminate all true Lilies (which include: Asiatic, Oriental, Easter, Tiger, Turk's Cap Lilies as well as Feed on all Fritillaria species. The best defense against these powerful little critters is to handpick when they are at the larvae stage.                                            


      Don't be surprised if you hear a "squeak" when they get squished! Control of these bugs can be challenging as they protect themselves with a "fecal shield" preventing treatment to get through. This is the stage at which they do the most damage and is best to remove them as soon as they can be identified. They typically can be found on the undersides of the leaves in the form of a red line.
     If you do continue to grow these types of lilies, be sure to space plantings to allow good sunlight penetration.  Diatomaceous earth can also be applied just before lilies start to emerge through the soil in early spring.
     You can still plant Daylilies, as Lily beetle doesn't typically affect these types.
 Have you ever seen how quickly your plants can become infested?  You can go from this...
                    To this...


     The above pictures of corn are of the same plant, the first one is completely pest free...or so we think! Insect infestations can happen so quickly.  If you are unsure of what the cob of corn is infested with, it is aphids. For almost every plant family,  there is a specific species of aphid for each one. Rest assured though because you will be able to successfully gain control when first seeing them. This is where lady bugs or lacewings will come in handy to help gain control.

     Many gardeners have been inquiring of this insect this past season. Even though he is tiny, he will quickly make a big mess of your plants. Yes, this is a photo of the infamous cucumber beetle that everyone is talking about lately. It is interesting how its name is derived as being the Cucumber Beetle.  This insect actually prefers squash and pumpkin foliage before nibbling on cucumber plants. Quick and efficient identification and treatment is essential when dealing with this little guy. Use of row covers as soon as the seed has been planted is your best defense against this pest.

     Row covers that tightly cover the soil surface where these seeds were planted, have shown great results. Once the plants are big enough and have set out their bloom, row covers will need to be removed. At this stage your plants are typically not in any real amount of danger as the population is decreased and the plants are large enough that bugs wouldn't be able to consume the plant. There are other ways in dealing with this insect, however row covers would be my first recommendation.  Once you have purchased row covers, you can use them for many different plants and other uses throughout the season as they are very easy to use and re-use. 
     Does the damage to this plant look familiar as well? I have seen and heard many gardeners talking of this problem with each year, especially on certain crops.  If you haven't already guessed what this damage is from, it is from flea beetles. As with many other destructive insects, flea beetles are very tiny and hard to identify. They rapidly pack a punch of damage in your garden especially on leafy green vegetables such as the Nappa Cabbage transplant pictured above. If you look closely, you may be able see a tiny little black bug resting at the top of the leaf of this plant. They basically make the plant look like it was poked with holes leaving almost a light brown transparent look to the leaf which eventually results in nothing but a stem. Use of row covers can also be used to treat this issue and should be applied as soon as seeds or transplants have been set out to the garden. 
     Last, but not least, as I'm sure you are familiar with this fully destructive "growing" problem.



     Pictured above is one of the biggest problems many vegetable growers have been experiencing in the more recent years. This pest gets its name perfectly from its "wiry" form and is known as Wire worm which later matures to a hard shelled beetle known as the Click. Adult Click Beetles overwinter in the soil and emerge in early spring. 

     Like most pests, it's the young stage that does the most destruction. The larvae (pest that has not reached full maturity) of most insects feed off the foliage or roots of plants and quickly grow into healthy mature adults. This life cycle continues all over again at certain times of the growing season as with the majority of insects.  In the case of wire worm, they tend to favour a habitat in many different levels of the soil, depending on what stage they are at. Wire worms feed off the roots of many types of plants and in particular vegetables. Most damage occurs in early spring mainly because at this stage the worms reach the top layers of soil. Wire worms find undisturbed areas are a great habitat for multiplying, so if you had just dug up and started a new garden location, unfortunately wire worm damage could be higher in the first few years but will decrease over time.
    Control measures for these pests is continuing to be quite a challenge.  Researchers have been working on coming up with ways to get ahead and at this point have found some solutions for minimizing but not necessarily gaining full treatment. Some helpful cultural practices can be followed: avoid very early or very late seeding, shallow tilling in early spring can injure and expose the destructive larvae, light topping of compost or even applying fertilizer that has a high Phorphorus count can be effective as well.  Compost should be applied late in the year or early the next spring and tilled in the soil. Manage your soils tilth, as damage is less likely in heavy or very light soil. In cool and wet seasons wire worms tend to be found in upper levels of soil resulting in much damage to your garden. However, the good news is that during hot and dry weather that we prefer, wire worms don't! They tend to migrate deeper into soil to find their ideal habitats and damage during these times is lessened.

      Another type of natural/organic ways of getting ahead, or behind, in this case... is to delay planting your crop or possibly planting earlier where and when weather permits. I'm sure many of you have heard reference of growing degree days . For further information on how growing degree days are defined, click the link above. This table is essentially used to determine when insect and disease population is at its height. By following this timely chart,  it will enable you to time your treatment plan in accordance to when these populations are at their highest. If you decide to follow growing degree days, it will help gain the best control in preventing plant distress and vulnerability. 
     Crop rotation is another term that we commonly refer to when recommending solutions for gardeners even if they didn't experience any issues with pests.  This is best practice from year to year to ensure re-infestation is minimized or completely controlled.

      A few more common destructive insects typically found on plants if growing in greenhouses are identified below:
                                      White fly
                                          Mealy Bugs                                      
        Of course there are many other types of destructive insects, and so many that it would take many blogs to mention, however it shouldn't prevent us from the joy of growing a garden and all of the benefits that go along with them.                                               
     Please feel free to contact us though facebook, email or good old fashioned phone calls if you are ever skeptical of what may be bugging your flower or vegetable gardens. We are always happy to help!

Next post: Plant diseases 

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