Applications. Mancozeb or Captan are the fungicides most widely used to prevent DM, but they are not systemic and they are susceptible to wash-off by rainwater. Dosages, concentrations, and exposure can be amplified in laboratory settings. To control scab on apple trees, mix myclobutanil with a broad-spectrum contact fungicide containing mancozeb and captan. It must be noted that fungicide exposure in the lab does not necessarily reflect what bees encounter in the field. It is a white solid, although commercial samples appear yellow or brownish. Bonide Captan Fungicide controls a number of diseases on various plants, fruits, and ornamentals, such as powdery mildew, damping-off, rust, anthracnose, botrytis blossom blight, late blight, early blight, and brown rots. 2 Captan can be used to control plant diseases such as black rot, early and late blight, and downy mildew, among others. Captan is a man-made fungicide used to control a range of fungal diseases on plants. Captan is effective against scab, black rot, white rot, bitter rot, Brooks spot, and blossom end rot on apples. 1 The pesticide was first registered in 1951. If consumed, it is very low in toxicity but it can be harmful to eyes. Bonide Captan Fungicide has never indicated a problem with disease resistance like many other fungicides. Also called “penetrants,” systemic fungicides work by becoming absorbed into the plant tissues and protecting the plant from fungal diseases as well as ridding the plant of any existing diseases. Many of the general purpose product mixes contain captan (see Table 2.4). Most protectant fungicides are good for about seven to 14 days of protection, and systemic fungicides for seven to 21 days depending on the product, the rate applied, weather conditions, and disease pressure. It is commonly used on both edible crops and ornamental plants. Captan. Captan is a man-made fungicide used to control a range of fungal diseases. It also serves as a control of damping-off disease which effects the seeds and seedlings. Captan is the best fungicide for blemish free apples, peaches, and roses. Captan 50W mixes readily with water. 3 Captan is a general use pesticide (GUP) that belongs to the phthalimide class of fungicides. Strobilurin fungicides are absorbed primarily into the leaf or berry cuticle and move very short distances in that same organ (mesosystemic). Captan 50W Fungicide is a multipurpose product for ornamentals and fruits. A high pH of water used in the spray tank can result in alkaline hydrolysis (breakdown) of some fungicides, notably Captan. Diseases don’t build up resistance to captan like they do some of the systemic fungicides, and it is safer for the environment than the so-called “organic” copper fungicides. Captan is a fungicide with protective and curative action. It controls damping-off, botrytis blossom blight, powdery mildew, anthracnose, rust, brown rots, early blight and late blight. Notable examples of systemic fungicides are include benomyl, cyproconazole, azoxystrobin difenoconazole, carbendazim, and propiconazole. A non-systemic fungicide introduced in the 1950s, it is widely used for the control of fungal diseases in fruits, vegetables, and ornamental crops. Bonide Captan Fungicide-50 WP #171 Bonide's Captan Fungicide is in a wettable powder formulation and acts as a contact fungicide for certain fungus diseases for fruits, ornamentals and grasses. Captan is a dicarboximide that is 3a,4,7,7a-tetrahydrophthalimide in which the hydrogen attached to the nitrogen is replaced by a trichloromethyl group. Captan affects a fungus by interrupting a key process in its life cycle. The fungicides tested that do exhibit negative effects on bees in the lab are Preston-Mix, Signum, Rovral, Captan, Ziram, Neem oil, and propiconazole. How Systemic Fungicide Works. 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