(2) 



^8? 



(3) 



Spores germinate 

 6 to 7 hours at 45"F; in 

 tion, the fungicide must 

 if necessary to spray in 



cause infection when trees are wet in 

 3 hours at 70 F. To get protec- 

 be applied before the rain or, 

 the rain, before the time for in- 



fection at the prevailing temperature goes by. 



There are two critical times when soecial attention must 

 be given for brown rot control: (a) during blossoming - 

 to protect against blossom blight, spur blight, twig 

 blight and stem canker, and (b) during ripening and har- 

 vest - to protect against fruit rot. During these times 

 there are usually rains which keep the trees wet and favor 

 disease development. 



(a) Blossoming period - pink, bloom, petal fall 



Pro 

 di sease 

 ling fru 

 f u n g i c i d 

 from yea 

 early bl 

 be neede 

 opened a 

 spray an 

 til tip 

 parti cul 

 weather , 

 f al 1 may 



tecti 

 devel 

 it rot 

 e appl 

 r to y 

 oom , m 

 d at 3 

 nd new 

 d to r 

 (s tigm 

 arly s 

 an ap 

 be ne 



n at this 

 pment ear 

 at the e 

 i cati ons 

 ear. The 

 i d-bl oom 

 to 5 day 

 growth t 

 eplace th 

 a) and wi 

 uscepti bl 

 pi i cati on 

 cessary . 



time not 

 1 y , but i 

 nd of the 

 needed de 



first ap 

 or later. 



i nterval 

 hat came 

 e f u n g i c i 

 Iting and 

 e to infe 



in shuck 



only 

 s imp 



seas 

 pends 

 plica 

 Rep 

 s to 

 out s 

 de wa 



dyin 

 cti on 

 - s p 1 i 



prevents 

 ortant fo 

 on. The 



on rains 

 tion may 

 eat appli 

 protect b 

 i n c e the 

 shed off. 

 g flower 



In pro 

 t and aga 



senous 

 r control- 

 number of 



and varies 

 be in pink, 

 cations may 

 lossoms that 

 previ ous 



The p i s - 

 parts are 

 longed rainy 

 in in shuck- 



Fungicides are usually applied as sprays but may be 

 applied as dusts in emergencies when protection is needed 

 and the time is short. Satisfactory fungicides in sprays 

 are dichlone, 50% WP, 1/2 lb; wettable sulfur, 95%, 5 lbs; 

 captan, 50% WP , 2 lbs; benomyl , 50%, 1/2 lb; and thiram, 

 65%, 2 lbs in 100 gallons of water. Dichlone has some 

 "kickback" effect - about 12 hours - when applied to wet 

 trees. Captain, especially when used with malathion, may 

 cause some leaf injury and "shot-holing" when applied to 

 tender young leaves on some varieties. 



Growers should read labels for dosages, use suggestions, 

 and precautions. 



(b) Late season, pre-harvest, and harvest control 



Immature fruit during mid-season usually do not rot 

 unless there is a great deal of wet weather but should be 

 sprayed for scab control. 



Fruit becomes increasingly susceptible as it starts 

 to ripen and mature and during harvest. There can be con- 

 siderable fruit rot in the trees if weather is rainy and 

 wet unless the fruit is wel 1 -protected with fungicide 



