Black root rot can affect large production losses in greenhouse crops. even though this fungal pathogen also has a very large horde range, the mainly sober troubles occur on pansy and vinca. Pansy and vinca plug infection has resulted in major plant losses.
Symptoms:
The black root rot fungus damages the root of the plant; in effect interfere with the root's ability to suck up nutrients. As a result of root injury, plants typically build up symptoms indicative of dietary anxiety. Yellowing of the younger growth is a common symptom. Root examination of infected plants usually reveals a lack of healthy, white roots; infected roots are usually off-white, gray or black, depending on the stage and severity of infection.
Control:
Control of black root rot can be not easy if the pathogen becomes established within the growing area. Pay harsh notice to hygiene. Do not use again plug trays or plastic pots. Store media in a place that is sheltered from pollution. Spot-check all plugs introduced into the growing area by carefully examining roots for healthy, white color. Stress has been revealed to very much improve black root rot. unfavorable temperatures, unwarranted wetness in the root area, too much levels of soluble salts and too much use of fungicides or further plant production chemicals have all been implicated in escalation of black root rot. Because plugs are vulnerable to a number of stresses, all plugs should be planted quickly as possible after appearance.
Several fungicides have proven effective. Use preventatively or at the first sign of infection for effective control. An acidic pH helps to manage black root rot; a pH range of 5.5-5.8 can reduce black root rot development.
