Why yellow cucumbers in the greenhouse due to five factors violations in the care:
Nutrition at the time of digging the soil in spring and autumn will enrich it with minerals.Suffice it to add rotted manure, ashes and superphosphate fertilizer rich in potassium.Only disadvantage of these minerals causes the leaves of cucumber first lighter, then manifested yellowing.This lack of effect on the fruit themselves - they begin to curl.
Lack of heat
Low night temperatures are one of the primary reasons why yellow cucumbers in the greenhouse.Cucumber - heat-loving plants, which are very sensitive to temperature changes.This is especially true in central Russia, where the latest attack in the freezing n
lack of water and low humidity
plant gives the signal that it lacks moisture, twisting and yellowing of leaves.With insufficient watering the roots take moisture from the stem and leaves, so the yellow cucumbers in the greenhouse.In this case, it must be remembered that the need for an active fruiting twice-weekly watering.For one plant is enough to 25 liters.warm water, and they will appreciate the delicious and juicy fruits.
To form the whip must be timely pinched and ovaries removed, if more than 20 pieces on one fruiting plants.The excess of the ovaries will also be the cause when the greenhouse cucumbers turn yellow and have an irregular shape.
Pests and diseases
Powdery mildew can appear after watering with cold water.The leaves begin to brighten and fade, ambulance will manganese spray solution and a solution of mullein.
With the defeat of the root is necessary to fertilize the soil dust chalk, ash and powdered charcoal.Plants whose roots have struck the disease must be removed along with the affected soil to prevent further spread to the healthy roots.
Spider mite primarily affects the inner side, there is a yellowing of the plot, and then the whole sheet.Warm environment in the greenhouse - a favorable atmosphere for the reproduction of the tick, so it impossible to defeat the plants, they need a special tool to disinfect "Akarin" or "Fitoverm."
One of the most dangerous enemies of cucumber - greenhouse whitefly, able to eat the juice of leaves and stems.Frequent weeding partially resolve this problem, because of which also turn yellow cucumbers in the greenhouse whitefly because it weeds switches to fruit-bearing plant.When airing the greenhouse should be possible to close the opening breathable mesh.Sprinkle with water to produce as much as possible and do not forget to loosen the soil, apply fertilizer in the form of humus sawdust, peat or humus.
cause of aphids on the plant is the same as in the previous case - the presence of weeds.Besides a thorough weeding and loosening the soil greenhouse must be regularly sprayed with soapy water and whip infusion of tobacco.
In order not to wonder why yellow cucumbers in the greenhouse, you should take into consideration all the above factors affecting the quality and fertility of this plant.