-13- 



Ferbam: This carbamate is sti'ictly a protectant fungicide T,dth no "kickback" 

 action. It controls scab well and is still the standard fungicide for controlling 

 cedar-apple and quince rusts, Brooks' spot, and bitter rot. It maj^ be used alone 

 but also does v/ell at half strength with half strength sulfur, dichlone, glyodin, 

 or captan. It is safer than sulfur v;ith lead arsenate on Bald^Tin and Red Delicious. 



Ferbam is the only scab fungicide' that is recommended vj'ith oil in Delayed 

 Dormant, It is not compatible Virith all oils and the grower should determine how it 

 mixes, v/ith the oil he plans to use, before he uses such a combination. Some grov/- 

 ers prefer to put on a separate spray or dust of ferbam, if needed, rather than use 

 a ferbam - oil combination, Ferbam may be used in bloom, 



Dichlone > This organic fungicide is an excellent scab fungicide and also con- 

 trols frogeye leaf spot and rusts. It may be used as a spray or dust for primary 

 scab control through calyx. It is not used in the covers. 



At full dosage, in an all season program, it tends to cause leaf chlorosis, 

 some fruit spotting or russetting, and a noticeable reduction in fruit set in sub- 

 sequent years. It is most commonly used at half dosage with lialf dosage sulfior or 

 ferbam or as a 3% actual dichlone dust for airplane application. The dust is also 

 applied vath ground equipment, or a spray may be used, toward the end of a pro- 

 longed vret period or vrhen "kickback" is needed, "Kickback" is about i^O to 50 hours 

 at 50°F, when applied to vret trees. Better results may be obtained at full dosage 

 in a rain application than with reduced dosages. If needed, it may be used in 

 bloom vdth no injury except browning of flower petals. 



The older dusty formulations of dichlone caused an uncomfortable skin irrita- 

 tion for some spray operators. The nevj- dustless dichlone is claimed to cause less 

 skin irritation. 



Dichlone is not compatible with oils and phenyl mercuries, 



Glyodin; This is a liquid fungicide lYhich gives very little residiie, a fine 

 fruit finish, and excellent scab protection. It is persistent and is not v/ashed 

 from the leaves easily by rain but has no "kickback" value. 



It controls Brooks' spot and sooty blotch but not black rot, mildew, or rusts. 

 For rusts, it is necessary to use ferbam in combination with glyodin at half dosage 

 of each. 



It has given very good scab control virhen used at half dosage vfith half dosage 

 of phenyl mercury, Tlie combination gives good protection and about 72 hours "kick- 

 back", 



Glyodin should not be used with oil and with liquid insecticides such as TEPP 

 and TDE (DDD). It has a tendency to cause leaf scorch when used with lead arsenate 

 on Cortland, BaMvin, R, I, Greening, and Red Delicious, Vihen used vdth lead arse- 

 nate, if no mercury is in the spray, an equal amount of fresh spray lime may act as 

 a safener. 



