09-08-2013, 03:47 PM
Integrated management of wilt of guava (Psidium guajava) caused by Fusarium oxysporum
ABSTRACT
During fortnightly surveys of guava orchards in different areas of Jammu, Fusarium oxysporum was isolated from the diseased roots and from the rhizosphere soil of guava plants. Resident strains of Trichoderma were isolated. Seven treatments (each replicated thrice) were applied to guava seedlings were (i) Carbendazim (0.1%), (ii) Thiophanate methyl, (0.1%), (iii) Trichoderma viride (10g/pot), (iv) Trichoderma harzianum (10g/pot), (v) Quick lime (!00g/pot), (vi) Formalin (diluted 5 times with water) @ 500 ml/pot), (vii) Control (Untreated). The plants were kept in open during rainy season. The Trichoderma spp. were applied to the rhizosphere of guava seedlings after digging soil near the root zone; quick lime, as powder, was mixed in the pot soil; formalin was used as soil drench, whereas 4 applications each of carbendazim and thiophanate methyl were applied as drenching at an interval of fifteen days during the rainy season. All the treatments were effective as compared to untreated control. In a pot experiment during 2011-12, carbendazim, thiophanate methyl, Trichoderma spp. and formalin were equally and most effective, followed by quick lime. However, during 2012-13, carbendazim was most effective followed by thiophanate methyl, Trichoderma spp. and formalin (the latter two were equally effective); quick lime was least effective.