Diseases of green beansare usually caused by infection with pathogenic fungi. Beans are sensitive to low temperatures, therefore thermal stress damage is often observed. Infected orpest infested beanshave limited growth, often dry out and yield a lower yield. Seehow to recognize diseases and pests of green beansand learn the best ways to combat them!
What to do to keep green beans free from diseases and pests? Photo pixabay.com
How to prevent green bean diseases?
Disease and pest preventionis the key to the correct and he althy cultivation of this plant. Therefore, you should take preventive measures such as:
- UseTolerant or resistant varieties of string beansto certain diseases,
- Cultivationnot too dense spacing , bean seeds should be sown in a row with optimal density,
- Carry out 2-3preventive sprayingevery 7-10 days in the period just before and during the flowering of beans and after flowering with the agents recommended in the vegetable protection program (in home and allotment gardens recommended there are mainly natural and ecological preparations, such as Biosept Active and Miedzian Extra 350 SC),
- Beans should not be grown in the same position for several years , especially if in the previous year the occurrence of diseases in the field was recorded,
- Regular removal of weeds helps to reduce the severity of diseases and pests,
- Seed treatment reduces or eliminates pathogens responsible for seedling gangrene,
- Conducting vetting and early detection of pestsin the bean beds is extremely important for the effective protection of green beans.
Diseases of green beans
Bean ring bacteriosis
Symptoms of green bean disease , which is bean ring bacteriosis, appear on all above-ground parts of plants.On leaves in the form of oval, light brown spots , surrounded by a brown border, which grow larger and cover the entire leaf surface. Roundish discoloration appears on the pods, additionally surrounded by a watery rim.As the green beans mature and turn yellow and the infested parts remain green
Protection of green beans against this diseaseconsists in spraying the plants after emergence and repeating the treatment after 10-14 days with agents containing copper compounds, e.g. the well-known preparation Miedzian 50 WP or Miedzian Extra 350 SC.
Fusarium wilt of beans
Green bean disease, which isfusarium wilt of beans, occurs already during the emergence of vegetables , causing seedling rot. At a later stage of growth, it attacks the root system, which makes the plants grow less and gradually die. In the early stages of development, the green bean dies completely, and in the later stages the growth of the infected plants is weakened.Lower leaves of green beans turn yellow, gradually die and fall offFusariosis develops more easily on acidic soil, therefore it is important to systematically liming the soil to inhibit the growth of the fungus. After noticing the first symptoms, spray the plant protection product, e.g.Miedzian 50 WP or Miedzian Extra 350 SC.
Gray mold
Gray mold on beans is easily recognizedby characteristic symptoms on shoots, leaves, flowers and pods, such asgray mycelium coatingThe most common infection is flowering and binding of pods, when moistening plants and inflorescences, in conditions of high air humidity.Watery stains on green beans covered with gray coating , drying out over time.
Inprophylaxis against this disease of green beans , avoid growing vegetables after plants that are particularly often attacked by gray mold, i.e. root vegetables. When the firstsymptoms of gray mold appear on thegreen beans, spray a crop protection agent such as Amistar Opti 480 SC or Switch 62.5 WG. People using only natural protection can reach for the biological preparation Polyversum WP.
Curd rot
Symptoms of hard rot on green beansappear as whole stem and pod wet rot. The places of the rot are covered with white fluffy mycelium, in which black, hard lumps form.As a consequence of sclerosis rot, whole plants die and wiltTherefore, after observing the first symptoms, spray the plant protection agent Amistar Opti 480 SC or Switch 62.5 WG.
Pests of green beans
The spider mite
A commonpest of green beans is the spider mite . Dry and hot weather favors the development of spider mites, while intense rainfall reduces their numbers.
The characteristicspider mite feeding symptoms on beansappear on the leaves as small, bright spots that gradually spread over the entire surface of the bean leaf.The pest also damages flowers and pods, causing them to fall off. As a consequence of the spider mite's feeding, heavily attacked leaves dry up, and the whole plants are covered with delicate cobwebs.
After noticing the first symptoms of feeding spider mites on beans , spray with plant protection products, eg Ortus 05 SC. From natural preparations for spider mites in beans, you can recommend Emulpar 940 EC
Beet aphid
Beet aphid is apest of green beans that causes leaves to turn yellow, distort them and inhibit the growth of the whole plantThe aphid transmits viruses that cause yellow mosaic and ordinary bean mosaic. It is important to spray Decis AL after the first pests or damage to the plants are noticed, and repeat spraying after 14 days if necessary. In ecological cultivation, we can combat aphids with Emulpar 940 EC.
Chimney alfalfa
Adult insects and larvae puncture the tissue, sucking the juices from the leaves, flower buds, flowers, and the apical parts of the green beans. In punctured places, plant cells die, turn brown and eventually dry up, and holes are formed in the lamina.Green beans controlled by this pest have a lower yieldDry and sunny weather is favorable for the occurrence of the alfalfa substitute.
When the firstfeeding symptoms of this green bean pest are observedfrom the first well-developed leaf phase to the end of the flowering phase, spray Mospilan 20 SP. We spray it early in the morning, when the insects are not very mobile.
MSc Eng. Joanna Białowąs
