226:). The disease has been observed in Europe and parts of Asia, and on wild hemp in Illinois, suggesting that it has spread to the Western hemisphere. The symptoms that correspond with this disease include discoloration of the leaves, irregular leaf shape and death of the leaves. The leaves will begin to turn yellow, and eventually the entire plant can die. A way to diagnose this disease is to look at the underside of the leaves. The fungus grows through the top side of the leaf and makes its fruiting body on the underside. The fruiting body is where sporangia are produced, and from the sporangia, zoospores are released, which are the infectious stage of this disease cycle.
257:
bodies that produce the infectious spores are located, and this is the part of the disease cycle that you would want to target and control. As an extra precautionary measure, a grower can choose to have their soil either heat-sterilized or pasteurized. This process heats the soil to very high temperatures, with intentions to destroy the overwintering oospores which would otherwise restart the disease cycle in the spring. This practice of soil sterilization can be very costly, and may not complete eradicate all of the resting spores. However, if the problem is extreme enough, it may be one of the last options left, asides from finding a new plot of land.
37:
235:
underside of the leaves of the infected plant. The sporangia pop open to release the zoospores, which require water in order to swim and infect a plant. The spores can also be transported by the wind, rain, insects, and even by people. At the end of the growing season, the pathogen overwinters by oospores that can be found in the soil or on plant debris.
248:
is also a beneficial cultural practice that can be done in order to reduce the spread of this disease. Proper spacing between plants is also important. When the plants are very close together, they trap moisture under their canopies and can be in contact with each other. If you can prevent the plants
256:
If the disease has become aggressive, it may be in the grower's best option to spray for the downy mildew. Products such as copper fungicide can be effective. However, it is important to ensure that the undersides of the leaves are sprayed well with the fungicide. The underside is where the fruiting
234:
Downy mildew of hemp requires cool, moist weather in order to produce spores. Usually these are the temperatures either during early spring or late fall, when it is typically cooler than 65 °F, and when the humidity is near 100%. The spores are produced by the sporangia, which emerge on the
243:
There are many ways to help manage and control this disease. One of the biggest things that people can do is being consistent with cleaning their gardening supplies. However, this means cleaning your tools after tending to each plant. Also, simple practices such as a shoe washing station at the
393:"The effect of plant population density and harvest timing on agronomic fibre yield and quality characteristics of industrial hemp (Cannabis), cultivar Alyssa, grown in the Parkland region of Manitoba, Canada"
593:
274:
McPartland, John M.; Cubeta, Marc A. (1997-07-01). "New species, combinations, host associations and location records of fungi associated with hemp (Cannabis sativa)".
526:
552:
513:
608:
36:
557:
613:
336:
603:
244:
entrance of every greenhouse can help minimize the risk of spreading the disease to multiple growing areas.
598:
429:
400:
150:
505:
474:
312:
172:
31:
531:
565:
461:
291:
127:
570:
283:
364:
413:
392:
222:
205:
117:
500:
107:
74:
61:
587:
245:
466:
87:
452:
287:
295:
487:
48:
539:
446:
209:
97:
313:"downy mildew of hemp (Pseudoperonospora cannabina) Technical Factsheet"
518:
208:
that causes downy mildew, which is a fungal-like disease caused by an
544:
423:
492:
249:
from touching each other, you can help cut down on the spread of
479:
427:
436:
337:"Downy Mildew: Symptoms, Treatment and Control"
8:
365:"Diseases of Landscape Plants Downy Mildew"
424:
20:
594:Water mould plant pathogens and diseases
266:
409:
398:
7:
358:
356:
307:
305:
220:The host of this disease is hemp (
14:
16:Species of single-celled organism
35:
391:Hermann, Anndrea Marie (2008).
363:Beckerman, Janna (April 2009).
1:
438:Pseudoperonospora cannabina
201:Pseudoperonospora cannabina
160:Pseudoperonospora cannabina
25:Pseudoperonospora cannabina
630:
609:Protists described in 1926
181:Peronoplasmopara cannabina
288:10.1017/S0953756297003584
178:
171:
166:(G.H. Otth) Curzi, (1926)
156:
149:
32:Scientific classification
30:
23:
317:Plantwise Knowledge Bank
408:Cite journal requires
188:Peronospora cannabina
276:Mycological Research
184:(G.H. Otth) Peglion
251:Pseudoperonospora.
581:
580:
566:Open Tree of Life
430:Taxon identifiers
216:Host and symptoms
197:
196:
192:
191:G.H. Otth, (1869)
185:
142:P. cannabina
129:Pseudoperonospora
621:
614:Oomycete species
574:
573:
561:
560:
548:
547:
535:
534:
522:
521:
509:
508:
496:
495:
483:
482:
470:
469:
457:
456:
455:
425:
418:
417:
411:
406:
404:
396:
388:
382:
381:
379:
378:
372:Purdue Extension
369:
360:
351:
350:
348:
347:
333:
327:
326:
324:
323:
309:
300:
299:
271:
190:
183:
162:
40:
39:
21:
629:
628:
624:
623:
622:
620:
619:
618:
584:
583:
582:
577:
569:
564:
556:
551:
543:
538:
530:
525:
517:
512:
504:
499:
491:
486:
478:
473:
465:
460:
451:
450:
445:
432:
422:
421:
407:
397:
390:
389:
385:
376:
374:
367:
362:
361:
354:
345:
343:
335:
334:
330:
321:
319:
311:
310:
303:
273:
272:
268:
263:
241:
232:
223:Cannabis sativa
218:
186:
167:
164:
158:
145:
118:Peronosporaceae
34:
17:
12:
11:
5:
627:
625:
617:
616:
611:
606:
604:Peronosporales
601:
596:
586:
585:
579:
578:
576:
575:
562:
549:
536:
523:
510:
497:
484:
471:
458:
442:
440:
434:
433:
428:
420:
419:
410:|journal=
383:
352:
341:Planet Natural
328:
301:
282:(7): 853–857.
265:
264:
262:
259:
240:
237:
231:
228:
217:
214:
206:plant pathogen
195:
194:
176:
175:
169:
168:
165:
154:
153:
147:
146:
139:
137:
133:
132:
125:
121:
120:
115:
111:
110:
108:Peronosporales
105:
101:
100:
95:
91:
90:
85:
78:
77:
72:
65:
64:
62:Diaphoretickes
59:
52:
51:
46:
42:
41:
28:
27:
15:
13:
10:
9:
6:
4:
3:
2:
626:
615:
612:
610:
607:
605:
602:
600:
599:Hemp diseases
597:
595:
592:
591:
589:
572:
567:
563:
559:
554:
550:
546:
541:
537:
533:
528:
524:
520:
515:
511:
507:
502:
498:
494:
489:
485:
481:
476:
472:
468:
463:
459:
454:
448:
444:
443:
441:
439:
435:
431:
426:
415:
402:
394:
387:
384:
373:
366:
359:
357:
353:
342:
338:
332:
329:
318:
314:
308:
306:
302:
297:
293:
289:
285:
281:
277:
270:
267:
260:
258:
255:
252:
247:
246:Crop rotation
238:
236:
229:
227:
225:
224:
215:
213:
211:
207:
203:
202:
193:
189:
182:
177:
174:
170:
163:
161:
155:
152:
151:Binomial name
148:
144:
143:
138:
135:
134:
131:
130:
126:
123:
122:
119:
116:
113:
112:
109:
106:
103:
102:
99:
96:
93:
92:
89:
88:Stramenopiles
86:
83:
80:
79:
76:
73:
70:
67:
66:
63:
60:
57:
54:
53:
50:
47:
44:
43:
38:
33:
29:
26:
22:
19:
437:
401:cite journal
386:
375:. Retrieved
371:
344:. Retrieved
340:
331:
320:. Retrieved
316:
279:
275:
269:
253:
250:
242:
233:
221:
219:
200:
199:
198:
187:
180:
179:
159:
157:
141:
140:
128:
81:
68:
55:
24:
18:
230:Environment
588:Categories
377:2018-12-31
346:2018-12-31
322:2018-12-31
261:References
239:Management
296:0953-7562
136:Species:
49:Eukaryota
540:MycoBank
532:10396417
501:Fungorum
453:Q7255251
447:Wikidata
210:oomycete
173:Synonyms
114:Family:
98:Oomycota
94:Phylum:
45:Domain:
519:3203999
124:Genus:
104:Order:
571:250692
558:291622
545:259643
506:259643
493:PSPECA
480:189457
294:
254:
527:IRMNG
467:4P6HK
368:(PDF)
204:is a
82:Clade
69:Clade
56:Clade
553:NCBI
514:GBIF
488:EPPO
414:help
292:ISSN
475:EoL
462:CoL
284:doi
280:101
75:SAR
590::
568::
555::
542::
529::
516::
503::
490::
477::
464::
449::
405::
403:}}
399:{{
370:.
355:^
339:.
315:.
304:^
290:.
278:.
212:.
84::
71::
58::
416:)
412:(
395:.
380:.
349:.
325:.
298:.
286::
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
