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Pests and Diseases in the Vegetable Garden

There are many things that can go wrong when growing a vegetable garden. Plant diseases and insects can wreak havoc in the vegetable patch. Below are a few things which can affect the health of plants and the amount of produce can be expected from each crop grown.

Producing healthy vegetables starts with healthy soil. This is probably the single most important part of gardening. Diseases and insects live in unhealthy soil.

  • Aphids

Aphids are very small insects that suck the sap from foliage of plants.

  • Biological Pest Control

This is one method of using insects to control pests in the garden. Biological pest control is a natural, nonchemical method of controlling pests and disease in the garden.

  • Brown Rot

Monilinia fructicola is a common fungus found on stone fruits. *Look for disease resistant trees when purchasing orchard stock.

  • Calcium

A crucial nutrient needed in plants to promote strong cells. It can be found in the root system of growing plants and stored in fruits as well.

  • Chlorosis

When plants are nutrient-deficient, the leaves will turn yellow and may become diseased. This is referred to as chlorosis because of the lack of chlorophyll in the leaves.

  • Club Root

Plasmodiophora brassicae is a fungus which infects the roots of Brassica plants such as kale, mustards, cabbage and others. The infection causes roots to swell which makes them unable to draw in the water and nutrients they need to thrive. Plants will die. The infection spreads by spores which enter the soil and can infect roots of other plants.

  • Companion Planting

Combining plants in the vegetable or flower garden and orchard that work together for instance, French Marigolds (Tagetes patula) attract nematodes and when planted in the garden draw these away from vegetable plants.

  • Defoliation

Leaves dropping due to disease, nutrient deficiency, lack of water or stress.

  • Fire Blight

A disease caused by bacteria (Erwinia amylovora) which first attacks the flowers and twigs then the branches of fruit trees. This disease often strikes fruit trees.

  • Fruit Fly

An insect, Drosophila melanogaster, which lays eggs on or beneath the surface of fruits and when the larvae hatch they begin to eat the fruit. This fills the fruit with holes and causes it to rot.

  • Fungicide

Fungicides are chemical products used to kill plant disease caused by fungi.

  • Green Manure

Cover crops, such as clover, which is grown to improve nitrogen level in the soil.

  • Honeydew

Much like it sounds, honeydew is sticky and sugary. It can be found on plants where aphids and some scale insects have deposited it. Ants can be found dining on honeydew.

  • Larva

Freshly hatched insects like the butterfly or moth caterpillar.

  • Macro-nutrients

These are the elements used in large amounts by plants and must be found in or added to soil for healthy productive plants. They include the primary nutrients nitrogen (N), phosphorus (P), and potassium (K). The secondary nutrients are calcium (Ca), magnesium (Mg), and sulfur (S).

  • Manure Tea

A tea made by soaking manure in water and then pouring the liquid through a thin fabric or wire sieve into a container. This liquid makes a good organic fertilizer.

  • Mealy Bug

A scale insect found most often in humid areas. They feed on plants by sucking the sap.

  • Micro-nutrients

These elements are sometimes called trace elements. Plants need these in smaller quantities than macro-nutrients. They are boron (B), chloride (Cl), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo) and zinc (Zn).

  • Mildew

Mildew is a fungus which includes the common downy and powdery mildew.

  • Mold

Mold is a fungus which can be found on decaying plant tissue.

  • Natural Enemies

Many pests in the garden can be controlled by using their natural enemies against them. For instance, to control aphids it is a good idea to invite insects such as; lacewings, ladybugs, damsel bugs and others.

  • Nematode

Thread-like or a worm-like parasitic organism that attacks the roots of plants, others attack the bark of trees such as pine and still others cause disease in grapes by spreading viruses.

  • Nitrogen

Nitrogen is a nutrient which promotes healthy growth and dark green foliage in plants.

  • Powdery Mildew

Powdery mildew is a fungal disease typically seen on plants in humid climates, although it can grow in other environment. Infected plants are easy to spot because white powder-like spots on the leaves and stems are obvious.

  • Scab

Scab is a fungal disease that affects fruit and foliage alike.

  • Scald

Also known as sun-scald, leaf-scald is caused by prolonged periods of very hot sunlight directly on plant leaves.

  • Scale

Scale is caused by insects such as aphids sucking the sap from foliage. This can cause severe damage.

  • Soil Amendment

Anything added to soil which improves its texture by either adding or allowing it to retain nutrients.

  • Sooty Mold (Ascomycete fungi)

Aphids and other insects release a sticky substance called ‘honeydew’ on plants where a fungus (mold) can begin to grow. This mold is called sooty mold.

  • Sterilized Soil

Sterilizing soil helps to kill bacteria, dormant weeds and other hidden organisms in the soil. Heating the soil to above 180 F sterilizes it.

  • Spotted Cucumber Beetle (Diabrotica undecimpunctata)

Spotted and striped (Acalymma vittata) cucumber beetles cause bacterial wilt in cucurbits such as cucumbers and melons

  • Squash Bug (Anasa tristis)

Bugs commonly found on pumpkins and squash. They attack all members of the cucurbit family of plants

The list above covers a few pests and diseases gardeners deal with during the growing season and beyond. Also included are a few things which help plants to remain healthy.

Also see Top 40 Garden Terms.

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