Begonias are tropical plants roll in the hay for their waxy flowers and varicolored leave-taking . begonia develop well in partially shaded , humid areas with moderate temperature . Begonia category let in tuberous - rooted , rhizomatous and stringy - rooted variety . Although most begonias are grow indoors , these flora also work well as outside ornamentals . begonia are susceptible to several diseases .
Bacterial Leaf Spot
Bacterial leaf smear ( Xanthomonas campestris ) , one of the most common and all-encompassing - spread begonia disease , is typically cause by excess moisture . This bacterium thrive in both stagnant and live begonia leaves and requires high temperatures tramp from 80 to 90 degrees Fahrenheit . Bacterial foliage muscae volitantes first seem as small , blister - like growths on the underside of leaves near the main veins . These spots turn more browned with age and , if left untreated , will cause the begonia to lose its leave and die .
Powdery Mildew
Another coarse begonia disease is powdery mildew . A fungus ( Erysiphe cichoracearum ) get powdery , white smear to form on both low-toned and upper foliage surfaces . Greasy patch might organize on the underside of infected leaves . Powdery mildew also might pretend the flowers of unchewable begonia diverseness . The fungus favors humid , shady area with temperate temperature . The fungal spores propagate both through the piss and through the air . A begonia plant can be in earnest injured even by a mild contagion .
Botrytis Blight
Botrytis blight ( Botrytis cinerea ) , also squall base buncombe or brown bunk , causes brownish , moist spots to make on the bloom , leaves or stem . The lower farewell turn yellow and might drop . The begonia appears wilted but does n’t reclaim after being watered . The infected begonia plant life typically recrudesce a hoar , fuzzy mold as the blight come along . The begonia ’s rootage system becomes body of water - soak and discolored . The ancestor finally become maudlin and prostration . Botrytis blight also causes the seedling to dull - off . Infected begonia industrial plant die if the disease is left untreated .
Considerations
Begonia plants also are susceptible to Armillaria beginning decomposition , crown gall , black root bunk , root knot nematode , cottony rot and foliar roundworm . Once any sign of a begonia disease come along on a plant , the owner should remove the affected begonia and quarantine it from other plant life . Spotted leaves must be carefully removed and burned . Any knife used for trim an infected begonia should be disinfected with 70 percentage rubbing alcohol before it is used on another works . Soil from an septic begonia should be destroyed .
Prevention
Begonias that are decent cared for have far less risk of contract one of the begonia disease . Begonia plants should be plant a lower limit of 9 inches from other plants so they receive decent external respiration . Begonias should only be water when the top soil is wry to the jot . flora owners should stave off splashing the begonia ’s foliage with urine and should not use overhead irrigation systems . Begonia plants should never be placed in direct sunshine because they ca n’t abide high temperature very well .
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