In the area surveyed, 80 farmers fields were inspected from all field visited the plants showing symptoms characteristics of cluster bean disease were observed and recorded (Plate 2). During
Kharif 2018-19 and 2019-20 it was observed that alternaria leaf blight, dry root rot and bacterial leaf blight on cluster bean were important diseases in these three district of Northern M.P. Three major cluster bean growing districts of M.P.
viz., Gwalior, Morena and Shivpuri were surveyed to find out the status of cluster bean in grid region of Madhya Pradesh. The data summarized (Table 1 and Plate 1) reveals that the disease has become a major biotic constraint in the cultivation of cluster bean particularly in Gwalior, Morena and Shivpuri districts.
Intensity of foliar diseases (Alternaria leaf blight, bacterial leaf blight)
During the year 2018-19 the disease intensity of alternaria leaf blight in Gwalior district was in the range of 16.00% (shakhani) to 23.00% (Raichura). In Morena district it was in ranged from 4.00% (Arahakapura) to 10.00% (Kailaras). In Shivpuri it was in the range of 0.00% (Khadi) to 4.00% (Aadoli). The pressure of disease in 2019-20 was low as compared to 2018-19.
The two years mean data also summarized in (Table 1) which reveal that in Gwalior district the maximum intensity of alternaria leaf blight was recorded in Masoriya block (24.00%) followed by Raichura (22.50%), Basodi (21.50%) and Kadaiya (17.00%), while the minimum disease intensity was recorded in shakhani village (14.50%). In Morena district the maximum disease intensity was recorded in Kailaras (9.50%) followed by Noorabaad, Mitawaligoan (7.00%), (7.00%), Arahakpura (6.00%) and Padawali (5.50%), whileminimum disease intensity was recorded in Joura block (5.00%) of the district. In Shivpuri district the maximum disease intensity was recorded in Aadoli (4.50%) followed by Mohana (4.00%), Dhumapura (3.00%) and Khadi (0.50 %), while karyawati village are free from Alternaria leaf blight that is (0.00%) of the district.
In the year 2018-19 the intensity of Alternaria leaf blight in Gwalior, Morena and Shivpuri was 20.60%, 6.83% and 2.00% respectively. While, in 2019-20 the disease observed in Gwalior, Morena and Shivpuri district was 19.20%, 6.50% and 2.60% respectively. As per the two year mean data presented in (Table 1) reveals that the maximum disease intensity was recorded in Gwalior (19.90%) followed by Morena (6.60%), while minimum disease intensity was recorded in Shivpuri district which is 2.30%.
In the year 2018-19 the disease intensity of bacterial leaf blight disease in Gwalior district was in the range of 12.00% (Raichura) to 26.00% (Basodi). In Morena district it was in ranged from 4.00% (Kailaras) to 12.00% (Noorabaad). In Shivpuri it was in the range of 0.00% (Khadi) to 7.00% (Karyawati). The pressure of disease in 2019-20 was low as compared to 2018-19.
The two years mean data also summarized in (Table 1) which reveal that in Gwalior district the maximum disease intensity of bacterial leaf blight was recorded in Basodi block (17.50%) followed by Kadaiya (11.50%), Masoriya (10.00%) and Shakhani (10.50%), while the minimum disease intensity was recorded in Raichura village (9.00%) (Fig 3). In Morena district the maximum disease incidence was recorded in Noorabaad, Kailaras (8.50%) followed by Arahakpura (6.00%), Mitawaligoan (5.00%) and Padawali, Joura (4.00%) respectively, while the minimum disease intensity was recorded in Kailaras village (3.50%) (Fig 4). In Shivpuri district the maximum disease intensity was recorded in Aadoli and Karyawati (6.00%) followed by Dhumapura (4.50%) and Mohana (3.50 %), while the minimum disease incidence was recorded in khadi village (0.50%) of Shivpuri district (Fig 5). During 2018-19 the incidence of bacterial leaf blight in Gwalior (16.80%) followed by Morena (7.17%) and Shivpuri was 4.80%. While, in 2019-20 the disease was observed in Gwalior district 6.40%, Morena 3.16%, while in Shivpuri intensity was 4.80%. The two year mean data represented in (Table 1) revealed that the maximum disease incidence was recorded in Gwalior (11.60%) followed byShivpuri (10.25%), while in minimum disease intensity was recorded in Morena district is 5.16%.
Incidence of soil borne disease (Dry root rot)
Dry root rot incidence in 2018-19 at Gwalior district was in the range of 3.00% (Raichura) to 7.00% (Shakhani). In Morena district it was in ranged from 3.00% (Arahakapura) to 7.00% (Kailaras). In Shivpuri it was in the range of 2.00% (Mohana) to 6.00% (Dhumapura). The pressure of disease in 2019-20 was low as compared to 2018-19. Also, the two years mean data summarized in (Table 1) reveals that in Gwalior district the maximum disease incidence of dry root rot was recorded in Shakhani block (6.00%) followed by Masoriya (5.00%), Basodi (4.00%) and kadaiya (3.50%), while the minimum disease incidence was recorded in Raichura village (2.00%) (Fig 3). In Morena district the maximum disease incidence was recorded in Kailaras (6.00%) followed by Arahakpura, Padawali (4.50%) and Noorabaad, Mitawaligoan, Joura (3.50%) respectively (Fig 4). In Shivpuri district the maximum disease incidence was recorded in Dhumapura (5.00%) followed by Khadi (4.50%), Aadoli (3.50%) and karyawati (2.50%), while the minimum disease incidence was recorded in Mohana village (1.50%) of Shivpuri district (Fig 5). As per survey data recorded in 2018-19 the incidence of dry root rot in Gwalior, Morena and Shivpuri was 4.20%, 5.00% and 3.80% respectively. While in 2019-20 it was observed that in Gwalior district the mean diseases intensity was 4.00% followed by Morena 3.50%, while in Shivpuri it was 3.00%. The two year mean data presented in (Table 1) reveals that the maximum disease incidence was in Morena (4.20%) followed by Gwalior (4.10%), while minimum disease incidence was recorded in Shivpuri district is 3.40%.
The comprehensive study through survey was the first to check out the relative importance of fungal and bacterial diseases of cluster bean in grid region of Northern M.P. Based on survey results alternaria leaf blight, intensity was ranked 1st out of the other two cluster bean disease. Thus alternaria leaf blight was found to be a relatively major disease of cluster bean in Northern M.P. During the survey results of the present study indicated that alternaria blight, dry root rot and bacterial leaf blight were restricted in local cultivars. There are several possibilities to explain the low prevalence and incidence of DRR in all cluster bean growing areas irrespective of cluster bean cultivars during the survey, including resistance, atmospheric conditions for disease infection and development and the use of seed treatment with fungicides. Widespread distribution of DRR, Alternariablight and Bacterial leaf blight in all cluster bean cultivars observed which were grown by the farmers and it is a matter of concern also. Average disease intensity of Alternaria blight and bacterial blight varied from 2.30%-19.90% and 5.16%-11.60% and disease incidence of DRR varied from 3.40%-4.25% on all the cultivars grown by the farmers. The random moisture stress and higher temperature in northern M.P. Probably predisposed the cluster bean crop to favourable condition for DRR development.
Pande et al., (2010). Research done on
R.
bataticola showed that temperature and moister stress are important factor for its infection
Pande et al., (2004), Akram (2008).