Vegetable and Fruit Crops Pathology

I. Apple Diseases

Fire Blight of Apple. Fire blight is a serious threat to apple production in Illinois. It occurs every year, causing blossom blight, shoot blight canker blight, and rootstock blight on apples and pears. To control fire blight of apple, dormant copper spray and application of antibiotic during bloom is essential. Copper must be sprayed prior to or at silver tip growth state. Copper should be applied to the entire orchard block, including non-susceptible cultivars. The reason for treating non-susceptible cultivars is that even normally fire blight resistant trees can be colonized by the bacteria and serve as a source of infection during bloom. Several copper compounds can be used in the dormant sprays. If copper sulfate is used, it must be applied when trees are dormant. If copper sulfate is applied later than silver tip, plant injury can result. Also, do not apply copper sulfate with oil; apply copper sulfate and dormant oil as separate sprays spaced at least 10 days apart. Fixed coppers such as Kocide and C-O-C-S can be tank mixed with early season oil sprays. For more information click here, and refer to: http://www.extension.iastate.edu/Publications/PM1282.pdf, http://www.aces.uiuc.edu/vista/abstracts/a801.html, http://www.caf.wvu.edu/kearneysville/disease_descriptions/omblight.html, Fire Blight Management.

Apple Scab. Early season spray for control of apple scab is essential. The first spray must be applies at green tip. Primary scab spores are mature and disseminated at early bloom. There are several fungicides (i.e., Topsin-M, captan, mancozeb, Sovran, Flint, Polyram, Syllit, Vangard, Scala,…) that effectively control apple scab. For more information on control of apple scab, consult Illinois Commercial Tree Fruit Spray Guide 2004" (http://www.extension.iastate.edu/Publications/PM1282.pdf). Also, more information on apple scab is available at websites:
http://www.aces.uiuc.edu/vista/abstracts/a803.html, and http://www.ipm.ucdavis.edu/PMG/r4100411.html.

II. Identifying and Manageing Cucurbit Pests

The publication Identifying and Managing Cucurbit Pests; Diseses, Insects, and Weeds in now available. To Place on order call 1-800-345-6087 or visit the website www.PublicationsPlus.uiuc.edu. For more information, click here.

April 15, 2005
	I. Apple Diseases Fire Blight of Apple. Fire blight is a serious threat to apple production in Illinois. It occurs every year, causing blossom blight, shoot blight canker blight, and rootstock blight on apples and pears. To control fire blight of apple, dormant copper spray and application of antibiotic during bloom is essential. Copper must be sprayed prior to or at silver tip growth state. Copper should be applied to the entire orchard block, including non-susceptible cultivars. The reason for treating non-susceptible cultivars is that even normally fire blight resistant trees can be colonized by the bacteria and serve as a source of infection during bloom. Several copper compounds can be used in the dormant sprays. If copper sulfate is used, it must be applied when trees are dormant. If copper sulfate is applied later than silver tip, plant injury can result. Also, do not apply copper sulfate with oil; apply copper sulfate and dormant oil as separate sprays spaced at least 10 days apart. Fixed coppers such as Kocide and C-O-C-S can be tank mixed with early season oil sprays. For more information click here, and refer to: http://www.extension.iastate.edu/Publications/PM1282.pdf, http://www.aces.uiuc.edu/vista/abstracts/a801.html, http://www.caf.wvu.edu/kearneysville/disease_descriptions/omblight.html, Fire Blight Management. Apple Scab. Early season spray for control of apple scab is essential. The first spray must be applies at green tip. Primary scab spores are mature and disseminated at early bloom. There are several fungicides (i.e., Topsin-M, captan, mancozeb, Sovran, Flint, Polyram, Syllit, Vangard, Scala,…) that effectively control apple scab. For more information on control of apple scab, consult Illinois Commercial Tree Fruit Spray Guide 2004" (http://www.extension.iastate.edu/Publications/PM1282.pdf). Also, more information on apple scab is available at websites: http://www.aces.uiuc.edu/vista/abstracts/a803.html, and http://www.ipm.ucdavis.edu/PMG/r4100411.html. II. Identifying and Manageing Cucurbit Pests The publication Identifying and Managing Cucurbit Pests; Diseses, Insects, and Weeds in now available. To Place on order call 1-800-345-6087 or visit the website www.PublicationsPlus.uiuc.edu. For more information, click here.