Cucumber (Cucumis spp.), like other cucurbits (melons, squash, pumpkins, etc.), are attacked by several pathogens that can result in severe crop losses. Most damage is observed on cucumber leaves and stems. Fruits can also be severely affected, resulting in overall poor quality and yield, especially if disease has already weakened the plant.

Mustard (Brassica juncea ) is vulnerable to several diseases. The most serious ones include downy mildew, white rust, sclerotinia stalk rot (white mold), leaf spots and virus mosaic.

Solanum melongena L. (eggplant) is a member of Solanaceae family. This is frost-tender herbaceous perennial, usually grown as an annual plant. Diseases such as Verticillium wilt, Southern blight, Phomopsis blight, Anthracnose fruit rot and Altenaria blight are commonly associated with eggplant and can reduce its harvestable yield significantly.

Cabbage, broccoli, cauliflower, brussels sprouts and kale are some of the members of the crucifer family often referred to as cole crops. Several diseases are associated with these plants, including root and stem rots of young plants, black rot, downy mildew and viruses.

Like any other crop, squash is susceptible to a variety of diseases that attack below- and above-ground parts of the plant. Major squash diseases include gummy stem blight/black rot, scab, powdery mildew, nematodes and several viral diseases. Because many of the fungal, bacterial and nematode pathogens survive in soil and/or crop debris, crop rotation with non-cucurbit crops for at least three years is highly recommended.

Potatoes (Solanum tuberosum L.) are host to many pathogenic organisms that can affect any plant part during the growing and storage seasons. Historically, certain diseases of potato have had significant socio-economical impact, like the Irish potato famine of the 1840s caused, in part, by Phytophthora infestans (late blight).

Most of onion diseases are caused by fungi that can contribute to severe losses and reduce yield, quality and marketability of the product. Diseases such as downy mildew and numerous problems caused by Botrytis spp. can cause extensive damage to the onion production worldwide. Other diseases can be equally important but are confined to certain geographical areas. To use best management practices, understanding and properly identifying these diseases is crucial.

Cauliflower (Brassica oleracea) and other cruciferous crops including cabbage, brussels sprouts and broccoli are susceptible to many diseases. Alternaria leaf spot and downy mildew are common in crucifer production and can reduce plant yield and market value. Alternaria leaf spot, in contrast to downy mildew, is favored by warm, moist weather.

The most common diseases of broccoli (Brassica oleracea L.) include black leg, black rot, downy mildew and soft rot. Black leg is mainly associated with the early stages of the plant development, while black rot and downy mildew are common when the plant matures. Both black leg and black rot are usually transmitted through seed or diseased transplants. Because of that, it is imperative that a grower plants disease-free, certified transplants or certified seeds.

There are nearly 75 known lettuce diseases with diverse causes that can be limiingt factors to lettuce production when resistant or tolerant cultivars are not available.