Trichoplusia ni, commonly known as the cabbage looper, is a moth in the family Noctuidae. Native to North America, it is a polyphagous pest (feeds on lots of different plants) that can cause significant damage in a variety of crops and potentially lead to plant death. While cabbage looper has a large geographical distribution, it[Read More…]
Kohlrabi
Cabbage is the crop most often affected by black rot, however, other crucifers such as broccoli, cauliflower, mustard, kohlrabi or brussels sprouts may be affected. The first symptom one is likely to notice is a V-shaped lesion on the margin of the leaf (Figure 1). However, severe symptoms may become irregular and jagged (Figure 2).[Read More…]
Late last season, I observed Alternaria leaf spot on kale. I want to use this article to review this disease on all brassica crops. This disease also occurs on broccoli, cabbage and other leafy brassicas. Alternaria leafspot usually doesn’t cause yield loss, but can cause unmarketable leaves. The symptoms on leaves usually include round, dark[Read More…]
Bolting of crops overwintered in high tunnels is common in the spring. ‘Bolting’ refers to lengthening and blooming of the flowering stalk. Bolting is often a problem because the quality of the marketable part of the plant declines. Also, plants subject to bolting are programmed to die once they complete flowering and seed production so[Read More…]
Cabbage is the crop most often affected by black rot, however, other crucifers such as broccoli, cauliflower, mustard, kohlrabi or Brussels sprouts may be affected. The first symptom one is likely to notice is a ‘V’ shaped lesion on the margin of the leaf (Figure 1). However, the symptom on Brussels sprouts observed recently are irregular, jagged[Read More…]