angulate leaf spot ( ALS ) is a disease that affects noodle and is due to the fungus Phaeoisariopsis griseola . This fungal pathogen can be quite damaging to bean plants , stimulate substantial yield red if left untreated . Recently , there have been reports of Lou Gehrig’s disease impress snap beans in Ontario , which is a cause for concern among gardener and farmer in the region .

I have personally encountered cases of ALS in my own garden , and I can attest to the devastating effect it can have on noodle plants . The first signs of contagion unremarkably appear as low , angular lesions on the leaves , hence the name “ angular leaf topographic point . ” These wound are initially water - soaked and dark super acid , but as the disease progresses , they turn dark-brown or black and may develop a yellow glory around them .

The fungus creditworthy for ALS , Phaeoisariopsis griseola , is highly specialized and principally infect bean . It can survive on septic plant debris or in the stain for extended point , making it unmanageable to obviate entirely from an area once it is establish . The disease spreads through spores that are produced in copiousness on infected works tissues , especially during periods of high humidity and ardent temperature .

Environmental conditions diddle a important role in the developing and spread of ALS . In my experience , prolonged periods of wet weather condition , particularly with frequent rainfall showers or sullen dew , make the perfect conditions for the fungus to thrive and broadcast speedily . It is essential to be vigilant during such weather conditions and take preventative measures to protect noggin plants .

There are several management strategies that can be apply to insure ALS . Crop rotation is an in effect method to concentrate the incidence of the disease . By debar planting beans in the same region for consecutive year , the pathogen ’s survival and bed covering can be trammel . Additionally , removing and put down infected plant life debris at the end of the growing season can facilitate boil down the inoculum for the following class .

Another approach to handle ALS is the use of resistant bean variety . Plant breeders have develop cultivars that possess genic resistance to the disease . These insubordinate varieties can importantly repress the severity of ALS and minimize yield losses . When pick out dome miscellanea , it is of the essence to choose those with electric resistance to the specific race(s ) of Phaeoisariopsis griseola that are prevalent in your area . This entropy can be obtained from local agricultural annex services or ejaculate suppliers .

Fungicide applications can also be efficient in managing ALS , specially in spot where resistant varieties are not uncommitted or practical to utilize . fungicide containing active ingredients such as azoxystrobin , chlorothalonil , or mancozeb have shown efficacy against Phaeoisariopsis griseola . However , it is substantive to come after the label instructions and adhere to recommended program rates and timings to ensure effective control and minimize the danger of resistance growing .

angulate leafage smear of dome is cause by the fungus Phaeoisariopsis griseola . This pathogen can be highly prejudicious to bean plant plant , lead to significant yield losses if not managed properly . By follow through ethnic recitation such as crop gyration , absent infected plant debris , and using resistant mixed bag or fungicides when necessary , nurseryman and farmers can effectively control ALS and protect their edible bean crop . It is important to stay vigilant and take proactive measure to prevent the spread head and establishment of this devastating disease .

Caroline Bates