How To Get Rid Of Brown Spots (Bipolaris fungus)

If you take proper care of your garden, it's unlikely that your plants will be damaged by brown spots - a disease caused by a parasite (a fungus that can grow as a mold in semi-dry environments ) called Bipolaris. The bad news is that such parasite is very hard to get rid of, but there are a couple of steps you may take to help you lessen the damage.

Healthy plants growing in nutrient-rich soil are naturally resistant, but, since such fungus may be spread by the wind or, at short distances, by rain or irrigation, it's important to be on the watch for any sign of the disease. Round dark brown spots on leaves, stems or grains should call your attention, specially if they show a light-greyish center and a light yellow halo. Once set in, brown spots are hardly controlled.

So, in order to avoid such trouble, you should look to avert the conditions for the development of these fungi in your garden, specifically mild temperatures associated with high relative humidity and frequent wetting. Also, keep plants pruned so that  there is ventilation and the irrigation water does not remain ponded on the leaves, this way both the temperature and humidity will be regulated. 

Since it's difficult to get rid of brown spots, the solution is to act preventively and apply fungicides such as Bordeaux mixture ¹,which might control the disease.

The best solution, however, is to choose seeds,  seedlings, and mature plants very carefully, purchasing the healthiest ones only, making sure you buy varieties that can resist such parasites.

Last but not least, remember that Bipolaris is a potential allergen and is the leading cause of allergic fungal sinusitis. Some people may even experience hay fever, or asthma. So, stay away from plants that show brown spots if you are allergic. :)

How To Get Rid Of Plant Lice (Aphids)

There is nothing more distressing than see your cherished plants  fading away because of those unwanted insects that can destroy the whole garden. I'm talking about these highly destructive insects called aphids.

Aphids are small sap sucking insects that can multiply rapidly, causing serious economic losses for farmers in general. They are also known as plant lice, greenflies, blackflies or whiteflies. There are over 4,000 species, of which at least 250 cause agricultural losses. They feed on plant sap by piercing the conductive vessels. In addition to direct losses, the aphids spread diseases among plants and favor the emergence of fungi.

Their reproductive cycle is very interesting, and in the warmer months of the year females produce other females parthenogenetically, ie, without fertilization in a viviparous manner, whereas in the fall, there is mating between males and females, and they become oviparous .

Depending on the species, aphids may show different colors, displaying  brown, green, yellow, red, gray, black, or almost colourless bodies. Natural predators of aphids are ladybirds, syrphid (flower-flies), beetles and wasps, but there are numerous other animals capable of preying them. Some ants, in order to get protection from predators, make use of an aqueous solution rich in sugars the aphids excrete.

It is possible to control aphids  naturally by introducing  predators and parasites in the affected areas. Other traditional, efficient forms of combat include spraying  tobacco syrup and mineral oil on the plants. Commercial insecticides should be used only when the plants are not flowering and fruiting, as they also kill beneficial insects to plants such as bees.

How To Get Rid Of Plant Rust

Time jetflies...it's May already, and this blog hasn't been updated since January, when hot sunny days were still going on in the southern hemisphere. Now that wintertime is getting closer, we have to look at our cherished plants more carefully to check if they've got any disease, and take the necessary measures to get rid of the unwanted intruders.

It's annoying to find those yellow-reddish or red-yellowish lesions on the plant leaves or on the stems, and you will want to get rid of them ASAP. That's plant rust which is a general term that refers to a rather large family of fungi that attack plants.

Rust fungi are very easy to identify on the plant. They can be characterized by a rust color on plant leaves and stems. The rust will start out as flecks and will eventually grow into bumps, appearing on the underside of the leaves of the plant.

Plant rusts often benefit from mild climates with moderate temperatures and high precipitation. There are higher incidences in wet years, which are prone to the formation of dew on leaves. These factors are ideal for the spores to germinate. So, do not overwater your plants. Also make sure that your plants have good air circulation inside the branches and around the plant itself. This will help it dry off its leaves faster.

The damaged caused by plant rust is irreparable as the plant tissues have no regenerative capacity. Thus, the best thing to do is work on prevention.Remove affected leaves at the first sign of rust color on plant leaves. The faster the affected leaves can be removed, the better chance your plant has for survival. Be sure to dispose of these leaves. Do not compost them.

Then treat your plant with a fungicide. Continue to remove leaves and treat the plant until all signs of the plant rust are gone.

An efficient fungicide is the homemade Bordeaux mixture. It consists of a mixture of copper sulphate, hydrated lime or quicklime and water.

Applications should be made preventively, as the Bordeaux mixture acts by contact, after a few days or after a rain of average intensity, new application must be made. Do not apply directly to all the plants; instead,  test it on a few leaves and see if there is no toxicity.You can dilute or concentrate the syrup if necessary.