For this assignment I interviewed Todd Metevia the Head grower at Timbuk Farms in Granville, Ohio. Timbuk Farms is a retail and wholesale grower and distributor. The crop I decided to question about was Coleus. They produce plugs of Coleus that are then sold wholesale to other nurseries. Coleus (Plectranthus scutellarioides) is a commonly grown ornamental plant due to its attractive foliage. Coleus is native to subtropical and tropical areas of Asia and Australia. Although not grown for flowers coleus still produces insignificant blooms that are often removed. In its native range Coleus is a evergreen perennial but in Ohio it is usually used as an annual bedding plant as it is not frost tolerant. Coleus is typically a shade plant but some
…show more content…
These include downy mildew caused by the oomycete (Peronospora spp.) , Impatiens Necrotic Spot Virus (INSV), greenhouse orthezia (Orthezia insignis), and sunscald. The symptoms of downy mildew can be as mild as stunted growth, but in severe cases irregular necrotic blotches on leaves develope and then leaf drop occurs. Signs of infection are carpets of grayish spores (Sporangia) on the undersides of leaves. Sporangia are released from sporangiophores when humidity levels are relatively lower. Downy mildew can be managed by planting cultivars that are less susceptible, and then applying a drench with a systemic fungicide such as Heritage (azoxystrobin), or Subdue MAXX (mefenoxam). (Hausbeck, M., Harlan, B. R., & Enzenbacher, T. B. , …show more content…
INSV is dispersed by western flower thrips (Frankliniella occidentalis). Thrips aquire virus by feeding on the sap of infected plants. The virus is transmited rapidly and only a few thrips are needed to cause a lot of damage. Management practices can include excluding thrips from greenhouses with a screen with holes that are smaller than 0.135 mm, removing and destroying infected plants in the greenhouse, buying culture indexed plant material, identify asymptomatic and symptomatic plants with INSV immunostrips, placing sticky cards around to indicate presence of thrips, removing weeds in the greenhouse that serve as resevoirs of the virus that can cause future infection, and applying the insecticide spinosad in rotation. (Joy, A., & Hudelson, B. , 2010) Greenhouse orthezia (Orthezia insignis) is a dark green or brown scale insect that is covered in white fluff, it damages plants by feeding on large amounts of sap. It can be managed by applying malathion on infected plants. (Plant Health Problems, 2007) Sunscald is caused when light levels are too high and symptoms include bleached leaves. Plants should be shaded if light levels are above 1300 umol or 700 WM2, place plants in shade after March
These include downy mildew caused by the oomycete (Peronospora spp.) , Impatiens Necrotic Spot Virus (INSV), greenhouse orthezia (Orthezia insignis), and sunscald. The symptoms of downy mildew can be as mild as stunted growth, but in severe cases irregular necrotic blotches on leaves develope and then leaf drop occurs. Signs of infection are carpets of grayish spores (Sporangia) on the undersides of leaves. Sporangia are released from sporangiophores when humidity levels are relatively lower. Downy mildew can be managed by planting cultivars that are less susceptible, and then applying a drench with a systemic fungicide such as Heritage (azoxystrobin), or Subdue MAXX (mefenoxam). (Hausbeck, M., Harlan, B. R., & Enzenbacher, T. B. , …show more content…
INSV is dispersed by western flower thrips (Frankliniella occidentalis). Thrips aquire virus by feeding on the sap of infected plants. The virus is transmited rapidly and only a few thrips are needed to cause a lot of damage. Management practices can include excluding thrips from greenhouses with a screen with holes that are smaller than 0.135 mm, removing and destroying infected plants in the greenhouse, buying culture indexed plant material, identify asymptomatic and symptomatic plants with INSV immunostrips, placing sticky cards around to indicate presence of thrips, removing weeds in the greenhouse that serve as resevoirs of the virus that can cause future infection, and applying the insecticide spinosad in rotation. (Joy, A., & Hudelson, B. , 2010) Greenhouse orthezia (Orthezia insignis) is a dark green or brown scale insect that is covered in white fluff, it damages plants by feeding on large amounts of sap. It can be managed by applying malathion on infected plants. (Plant Health Problems, 2007) Sunscald is caused when light levels are too high and symptoms include bleached leaves. Plants should be shaded if light levels are above 1300 umol or 700 WM2, place plants in shade after March