Sweet peas ( Lathyrus odoratus ) are elegant cool - time of year annuals with brilliantly colored flowers . They farm best in moist , well - drain grunge and full sun . Sweet peas are members of the legume crime syndicate and thrive in early spring before summertime ’s heat wilts them . While they are generally easy to raise , odoriferous pea are susceptible to some disease that can cause their leaves to turn yellow .

Mosaic

The pea mosaic virus can cause yellowing and mottling of the sweet pea plant ’s leave of absence . Symptoms let in foliage with dark unripened areas fuse with yellow - dark-green areas . The mosaic computer virus is circularise by aphid , which can be treated with an insecticide and by controlling nearby weeds .

Powdery Mildew

Powdery mold ( Erysiphe polygoni ) is a gray - blank emergence on the stem and leaves of infected sweet pea plant plant . As the fungus progresses , septic foliage will yellow and wither . The powdery mildew spore are spread through the air . Use a antimycotic regularly and as before long as you blot the powdery mildew .

Spotted Wilt

spotty wilt is a virus that causes rotary maculation on leaves that are first yellow , then brown . The computer virus , which can belt down your plants , is spread out by thrips . Use an insect powder and restraint nearby Mary Jane , including dope .

Ramularia Leaf Spot

Ramularia leaf spot is a fungus specific to sweetened peas that cause large suntan to yellow spots on plants , start up with the lower leave-taking . After contagion , the farewell often will drop . The fungus live in foliage that has been murder , so do not compost infected plant life . excessively wet condition can cause the fungus to appear . The University of California Agriculture Department recommends not planting seraphic peas in the same region each year if you have trouble with the fungus . Water mellifluous peas at ground grade and use a antifungal if necessary .

Manganese Deficiency

yellowish leaves are often due to a manganese inadequacy , according to Cal Poly State University . The insufficiency is ofttimes see in stain with a very mellow pH. Manganese is vital for photosynthesis , and a lack of it will cause chlorosis ( reduced chlorophyll ) . Do a garden pH trial and total sulfur as need to amend the grunge .

References

…