Status of tomato late blight
disease in tropical Africa: In the tropical Africa, late blight
disease is constantly re-emerging in every growing season and where it occurs, it spreads very rapidly within the leaves and fruits of the infected plants in the field, and consequently, spreading out to the entire field causing economic loss and often total destruction of the crops in the field (Agrios, 2005).
In such scenario, the present study aimed to evaluate the yield and the reaction of potato genotypes to both late blight
and early blight under an organic system of culture.
The nine traits are suitability for use as boiled potato, suitability for use in preparing stew, market demand, late blight
resistance, drought tolerance, tolerance to desiccating wind and heavy precipitation, high yield, long shelf life and suitability for sequential harvesting.
Potato late blight
can destroy fields in days, and was central to the Irish Potato Famine in the 1840s when 2 million people died from starvation and disease.
Bacterial spot caused by Xanthomonas perforans and late blight
caused by Phytophthora infestans are one of the major problems in fresh-market tomato.
The field efficacy of Metiram 55% + pyraclostrobin 5% WG, iprovaliadacarb 5.5% + propineb 61.25 % WP, dimethmorph 50% WP, mancozeb 75% WP (0.2%) + dimethomorph 50% WP, famoxadone 16.6 + cymoxanil 22.1% SC along with mancozeb 75%, cymoxanil8 + mancozeb 64% WP, and metalaxy 8 + mancozeb 64% WP were evaluated for late blight
1, a Tm-22 homolog from Solanum venturii, confers resistance to potato late blight
. Molecular plant-microbe interactions.
Prediction of disease model would be helpful to apply two or three sprays of fungicides (Phenylamide and Propineb) to control late blight
of potato successfully.
Good hybrid pick: Released by North Carolina State University in 2010, 'Plum Regal' (V, FF, TSW, EB, LB; pictured on Page 36) is a firm, heavy-bearing paste tomato with resistance to late blight
and tomato spotted wilt virus, an increasingly common disease in warm summer climates.
New vegetable seed varieties that gardening enthusiasts will want to try include Mountain Magic tomato (a late blight
resistant Campari type), Latte sweet corn (an exceptional, early sugary enhanced bicolor), and Naked Bear pumpkin, (a small pie pumpkin with hulless, edible seeds).
Lead author Professor Jonathan Jones from the Sainsbury Laboratory, said that breeding from wild relatives is laborious and slow and by the time a gene is successfully introduced into a cultivated variety, the late blight
pathogen may already have evolved the ability to overcome it.
Signs of late blight
appear suddenly but predictably in Ireland as soon as the summer weather turns humid, spores of the funguslike plant pathogen wafting across the open green fields and landing on the wet leaves of the potato plants.