Fungous diseases are those caused by parasitic fungi, and with them are grouped the very similar bacterial diseases.
Parasitic fungi are mostly microscopic. They invade higher plants and grow in their tissues (cells), which they kill and then absorb the contents for food. They penetrate and grow in the plant cells by means of fine fungal threads (hyphae), and spread from plant to plant by means of spores (the equivalent of seeds in higher plants). These spores are formed at the ends of special threads, often inside special fruit bodies, and are produced in enormous numbers. When released, they are carried by wind currents or water (by splashing) to healthy plants, where they alight, germinate, grow into the tissue and spread the disease.
Most fungous parasites spend winter on the plant or in the soil by forming a thick-walled structure which is resistant to adverse weather.
These fungous parasites are of two types. The first â€â€which includes the powdery mildews (common on many plants such as roses, delphiniums, lilacs and zinnias)â€â€produces a whitish growth on the surface of the leaves, stems, and petals. This growth is made of fungal threads and spores, which cover the leaf surface and feed by sending down a kind of sucker (haustorium) into the surface cells (epidermis) to absorb nourishment. In the second type, the parasite grows down deeply into the internal tissues, sending up threads to produce spores at the surface. The first type is easy to check; unfortunately most fungous diseases belong to the second. |
|
 |
Hand Feeding Koi -
Hand feeding Koi , San Jose Scale is a great way to enjoy your water gardening. , Insects and Pests If you have been feeding your fish , Creating a New Garden by simply throwing the food , How To Transplant Seedlings on top of the water , Propagating by Layering then stop doing that straight away. Instead, bring your feed bag next to the pond , Repotting Bonsai and kneel down. Place , Propagating by Layering a fe...
The Vine Leaf Blister Mite -
The vine-leaf blister mite (Eriophyes vitis) is an exceedingly small mite, having a white , Red Spider elongated body hearing two pairs of legs situated near the front. The mite passes through the winter , Tomato Mite beneath the bud-scales and commences to feed on the under-surfac...
Growing Cacti and Succulents -
Cacti and Succulents , Seedling Transplanting thrive on neglect and are almost the only plants , Adenium that need no watering when you go on holiday. In addition, they are untroubled by central heating or air , Adenium conditioning....
Flowers and Colour -
The ideal bed for picking contains annuals , Bamboo Floors and perennials, , Bamboo Flooring together with plants , Bonsai - Buy or Grow? and shrubs , How to grow Tomatoes for cutting for their foliage colours. , Pruning But there is also the question of what colour flowers , How To Plant Trees to grow. , Garden Furniture Naturally this is more a matter of personal taste than anythin...
Preparing your lawn - Levelling -
You can level an area fairly accurately by these means. You will need a straight edge and a carpenter's or bricklayer's spirit level. The straight edge could be a piece of 15 x 2.5 cm oregon or other, light , How to Use a Dibble timber, dressed straight and parallel and about...
Houseplant Drainage -
Good drainage is important in the cultivation of practically all plants , Miniature Roses grown in containers. Soil , Pruning Houseplants should be sufficiently porous to permit the free passage of water , Planting a Rose Garden and the bottoms of the containers should have holes through which surplus water , Home Grown Tomatoes may drain....
Plant Bacterial Diseases -
Bacteria which attack plants , Bonsai Propagation are much smaller than parasitic fungi but infect in a similar manner by living in, and killing, the tissues. Some species are able to persist by remaining in plant , Repotting Bonsai debris or in dormant cells in the tissue of seeds, , White Louse Scale corms, bulb...
Organic Food -
To understand what organic , Tiles food is, one must first understand the definition of organic , Fruit Fly soil since food , The Green Peach Aphid is the product , Spring Bulbs of the soil. , Spring Bulbs Organic , Bonsai Containers soil has been defined as one in which no chemicals or poisons have been used and in which there is an adequate supp...
Growing Apples, Pears and Plums from Pips -
No great heat , Great Pergola Plants is needed for these. In fact, the reverse is true. Start by placing pips or stones , Indoor Plants for Warm Rooms between pads of cotton-wool (which must be kept moist) in the refrigerator until shoots appear. Then plant , Tree and Shrub Propagation in compost , Hoodia Gordonii and treat in the usual way. (Cherry ston...
|
|
|
|
