Pear scab

Pears Scab Venturia inaequalis Bordeaux mixture... 

Fruit with olive-brown, corky spots that turn dark brown. Cause Pear scab. This fun-... 

Leaves with dark, velvety patches. Cause Pear scab. The spots are mostly on leaf undersides, and infected leaves often pucker and drop. For more information, see Fruit with olive-brown, corky spots that turn dark brow n" on page 168. 

Pear psyllas. 169-70,169,314,314 Pear sawflies. 314,314 Pear scab,168-69,170 Pear slugs... 

Fenbuconazole (Table 17.11) is a triazole fungicide intended for use as an agricultural and horticultural fungicide spray for the control of leaf spot, yellow and brown rust, powdery mildew and net blotch on wheat and barley and apple scab, pear scab and apple powdery mildew on apples and pears. Fenbuconazole was already presented to the public in 1988 by Driant et al. [43]. 

Many compounds containing the N—S—CCI3 grouping have been shown to have broad-spectrum potent fungicidal activity. Captan is the best-known example and was introduced in the early 1950s as a seed dressing and for the control of apple and pear scab and botrytis. Note its easy and cheap synthesis which commences with a Diels-Alder reaction. 

Uses as fungicide to control scab on apples and pears rusts and powdery mildews on ornamentals black spot on roses ... 

Uses fungicide/algicide as fungicide for control of blossom blights, scab on apples and pears and brown spot on stone fruit, etc. also used to control blue-green algae in ponds, lakes, and swimming pools. 

Chemical Name V-dichlorofluoromethylthio-AW -dimethyl-V- -tolylsulphamide 1,1 -dichloro-/V-[(dimethylamino)-sulfonyl]-l-fhioro-V-(4-methylphenyl)methane-sulfenamide Uses fungicide/acaricide to control scab on apples and pears Botrytis on strawberries, raspberries, blackberries, currants, grapes, ornamentals, etc. 

Uses as fungicide for control of powdery mildews in fruit, vines, and vegetables scab and rust in apples and pears ... 

Control of scab, powdery mildew, mildew, scald, net blotch, glume blotch on apples, pears, vines, cucurbits, Sugarbeet, cereals, vegetables... 

SECONDARY INFECTIONS. Soou after the appearance of the first symptoms (about 2-3 weeks after infection) the conidiophores break through the cuticles and form the pear-shaped summer spores (conidia). These are produced in large numbers and can lead to an explosion of scab infection if weather conditions are optimal. Conidia are released and spread by rain-... 

Mildew, scab, rust mites, pear pox mites Preventive against fungi, kills the germinating spores... 

Disadvantages Temperature-dependent (at least 15-18°C) At higher dosages (over 3 kg/ha) and higher temperatures sulphur is harmful to predatory mites Very poor effect against scab Is not tolerated by all apple and pear varieties Cannot be mixed with paraffin oil... 

Peach aphids, green, 269,419 Peach leaf curl, 344,383 bordeaux mix for, 467 copper for, 471 peach and, 165,167,383 Peach rosette, 168,394,394 Peach scab,165,166 Peachtree borers, 313.313 apricot and, 27 cherry and, 69 peach and, 165, 168 pheromone traps for, 437 Peach twig borers almond and, 17 apricot and, 26 peach and, 165, 166-67 Pear, 168-71... 

Dichlone is primarily used as a fungicide. It is especially effective for brown rot of stone fruit and scab on apples and pears. Dichlone is also used to control blue algae. There are no registered uses for dichlone in the United States. 

Most of the highly benzimidazole-resistant isolates of Venturia nashicola (the scab fungus of Japanese pear) show increased sensitivity to the Ji - phenylcarbamate compound MDPC and the jt-phenylformamidoxime compound DCPF, but the intermediately and weakly benzimidazole-resistant isolates did not. Doubly resistant isolates, i.e. highly benzimidazole-resistant isolates with the resistance to MDPC and DCPF were found. 

Ditalmifos (marketed only in Europe) is a contact fungicide used for the control of powdery mildews and scab of apples and pears. Allergic contact dermatitis to ditalmifos used as a rose spray was reported by van Ketel [118]. 

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