DISEASES OF PLANTS. 945 



fiinitns. Imiinlo diseases, mikI as|i;ir;imis I'ust. In .-Hldil inn. iii\rsli,L,';iti(iiis 1i:i\p 

 Ikhmi iK'f^uii on rose diseases and cilnis fruil diseases. 



Tbe pear blight work is iarp'ly in ciKiiieratieii wiiji the I'.ureau nf I'iaiit 

 Industry of tliis Deparlnieut. and censists in (lie aiiplicalion ef llie nielliods 

 reeoiunionded l)y that I'.ureaii. A detailed aeeunni nl' Die in\csli;^ations in the 

 ilitferent counties is udvcn. It lias lieeu found that tlioreu^li winter iiruniug pre- 

 \-ents blossom infection in the sprin^^, and Dial the larger tlie district covered 

 in the winter the less will be the infection the following season. Freiiuent and 

 prompt summer cutting is to be itracticed, and if not exposed to extrcMuely 

 abundant iid"e<-tion, a jieai- di'diard can be jirolitably maintained in good 

 condition. 



'the walnut bliglit iuNcst igati(]n lias been a continual inn i>\' studies cm tbe 

 bacterial ilisease of walnuts due to I'sriidoinoiius ju</lajiilis. Thus far the dis- 

 ease has proved difficult to control, as sjiraying exi)erinieiits liavc not been very 

 successful. T!h> size of the trees made spraying almost proliibiti\-e. on account 

 of tlie dillicul1.\' and e\|ieiise. 



The investigations on lemon rot, due to the fungus Pi/lliliiri/slis liho/ili lliDia. 

 have been i)reviously described ( E. S. K., bS. p. :!44). 



The beet bli.ght described api)ears to be due to a derangement in the normal 

 fiuictions of the plant, and investigations seem to show that by attention to 

 lilantiug and cultivation in connection with weather conditions the disease may 

 lie largely coidivdled. 



The iieacli blight or shot-hole fungus reported upon is due to a species of 

 Coryneum. and sprayin.g with Bordeaux mixture proved quite efficient in con- 

 trolling it. In addition to the peach, the almond is subject to this disease, and 

 probably the fungus will be found to attack other stone fruits. 



'{"be tniiiato disease investigations are bi'ietly summarized from a previtms 

 publication (10. S. U.. 17, p. 1082). 



The other investigations are brlefl.v described, and the bulletin concludes with 

 a list of the more conunon plant diseases' that have been observed throughout 

 the State, with notes as to their relative imiwrtance. 



Report of the government mycologist, T. Petch {('ire. diid Af/r. Jour. Roy. 

 Hot. (Idiil. Cviilon, .? (I!l0(>), yo. 21, pp. 277-280'). — Among the fungi observed 

 during the year the author reports jiarticularly upon leaf and root diseases of 

 lea, I'ara rublter. cacao, Castilloa, and cotton. 



The tea diseases attacking the leaves were .gray blight { I'cshilozzia nnciiiiii). 

 brovvu blight (f'ollrtofriihiii)t cavieUke), and dcrco.sponi llicir. The root dis- 

 ease was princiiially due to the fungus Rosellinia. Stem diseases <lue to Xectiia 

 are also described. 



The leaves of llcrcd l)i-(i.sili('nsiN were found to lie attacked b\- /'. f/iicpiiii. 

 ni-lmitithosijoriinn Jievcd'. Glwosporiiim hruiiiieurn, and Collctot rich inn hcrcw. 

 The root disea.ses described were caused b.y Pomes seniitostiis, I'oria riiictu, 

 and an undescribed species of Ilynienocha'te. A blackening and decay of Ilevea 

 fruits, which was observed to be especially destructive, was d>ie in most 

 instances to a species of Phytopbthor.-i, simil;ir to that found on cacao pods in 

 other countries. In addition, the rotting fruits showed the presence of 

 Sphrrromema album, Nectria diver sinpora, and Diplodia zehrina. 



The species of Hymenochjete which occurs on Ilevea was found attacking 

 cacao as a root parasite in several instances and also destroying the roots of 

 cotton. 



The iiriiiri]i.il jiarasite observed on Castilloa was liotri/oiliplodid ehistica', 

 which attacked trees the bai'k of which had suffered injury. 



Indiana plant diseases in 1906, F. D. Kern {ludiaiia Sta. Bill. 119, pp. 

 Ji27-.'i3G). — Lists are given showing the distribution of various plant diseases 



