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Preventive measures
DID YOU KNOW?
Stemphylium blight, caused by the fungus Stemphylium vesicarium, is a dreaded disease of onion crops. It can lead to yield losses, especially in climatic conditions that favor its development.
Symptoms
Typical signs of stemphylium blight in onions include:
➔ At first, the spots are small, pale yellow and moist. They become elliptical, pale brown to purple in the center, often surrounded by a purple halo.
➔ Progressive necrosis of leaves, which begin to dry out as they move toward the apex.
➔ Premature leaf drop, compromising bulb development and keeping quality.
Factors favoring the disease
Stemphylian blight develops particularly well under the following conditions:
➔ High relative humidity (>80%) due to watering, dew or frequent rainfall.
➔ Moderate temperatures (18-25°C), which accelerate the spread of the fungus.
➔ Hydric or nutritional stress on plants, making them more vulnerable to infection.
Control and prevention strategies
To protect onion crops from stemphylian blight:
➔ Choose varieties that are resistant or tolerant to the disease.
➔ Remove and bury crop residues.
➔ Monitor humidity by spacing watering and promoting good drainage.
➔ Apply specific fungicides, especially during periods of high humidity.
➔ Avoid wounds on leaves, which can serve as an entry point for the fungus.
➔ Carry out crop rotation with non-susceptible crops to limit the presence of the fungus in the soil.
How to recognize a Chinense pepper?
Shape and size: Chinense peppers are often round globose or elongated globose. Their weight varies according to variety, ranging from 3 to 65 g.
Color: before ripening, peppers are green. When ripe, they take on yellow, orange or red hues, like the PHENIX variety.
Skin: often smooth and shiny, but some varieties can have a rougher texture, like the FIRE KISS variety.
Flavor and aroma: fruity, fragrant and pungent, more powerful than other types of chili, such as the ATAYINKA variety.
Cultivation and foliage: plants are generally bushier with broad leaves 🌿
Next time you come across a chili pepper, you’ll know if it’s a Chinense type! 🔥
Sorrel bissap is a multi-faceted plant, appreciated both for its gustatory qualities and its health benefits.
Cooking
Health benefits
Guinea sorrel is a plant with many virtues. It is part of traditional African pharmacopoeia.
Find all our Guinea sorrel varieties on the Technisem mobile application: https://play.google.com/store/apps/details?id=com.technisem.app&pcampaignid=web_share
Sexual confusion using pheromones 🌾🦋
Sexual confusion, an innovative agricultural method! Using synthetic pheromones, we reproduce the hormonal scent of females, specific to each pest species. This saturates an area with female pheromones, making it more difficult for males to find females to mate with.
This strategy reduces the production of eggs and therefore larvae, thus limiting direct damage (destruction of flower buds, consumption of fruit) and indirect damage (wounds, entry points for secondary parasites).
🔍 How does it work?
Pheromone diffusers are installed in the plot, in the form of ties, sprays or capsules. Capsules protect around 20 m², i.e. around 500 per hectare. Sprays cover a larger area, up to 5,000 m² (0.5 ha).
🌿 Efficiency and collaboration
To be effective, mating disruption must be used consistently and over a sufficiently large area, estimated at a minimum of 5 hectares. This requires collective work by farmers to guarantee effective protection of their plots.
🚫 Risk reduction
Even if this method is effective, the periphery of the protected area is not immune to the penetration of fertilized female moths. Sometimes, the use of insecticides is necessary at the edge of the plots to avoid risks.
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