THE MONTHLY BULLETIN. 521 



The following' is tikcii from l^ullctiii \2'2. "Citrus ("aiikcr." Flm-ida 

 Agricultural Experiment Station: 



DISTIXCTIOX FUO.M Ol'llKK DISEASES. 



"The other cili-us diseases with wh'uli this mic is likely to he confused an> Scab, 

 Scaly liark. and. possibly. Anlhracnose. H can !)<■ distinguished from any of these 

 by tile following; points of ditference : 



"(1) It diffi-rs from Scab in the roundness of the typical spots, in llii! larjier size 

 of the spots, and in their white or jjrayish color. It iloes not distort the leaves, nor 

 oause the wart-like projections that are common in infections of Scab. Canker is 

 found on the older wood, while infections of Scab never occur on older twigs or 

 branches. 



"C2) It differs from Scaly liark in iirodiicinu; imidi smaller si)ots. which are more 

 circular in outline. Scaly "P.ark spots usually show a hard ;zlazed surface, while 

 Canker is more sixm^y. Canker is common on the ;;raiiefruit. and forms spots on 

 the leaves: while Scaly liark rarely attacks si":ip«'fiuit or causes spots on the leaves. 



"(3) Canker differs materially from Anthracnose spotting;. Anthracnose sjwts are 

 sunken, usually many times larger, and much firmer and more compact. Anthracnose 

 occurs only oii fniit! and does not attack young shoots or twigs." 



Florida, Louisiana and Alahama have is.sued quarantines against 

 citrus nursery stock because of tins disease. It is most severe on 

 pomeloes l)ut attacks Satsumas and all kinds of oranges. As yet we 

 feel certain that the disease does not occur in California. Our strict 

 inspection of all importations fnmi Japan and our (quarantines again.st 

 citrus nursery stock from the (Julf States because of the white fly 

 and against Florida and the island of Forto Kico on account of 

 Melanose will do mucli to safeguard our citrus groves. Our small 

 plantings of pomeloes, Satsuma oranges and citrus on trifoliate stock 

 will also aid us in keeping free from this citrus canker. 



We quote the following from a letter received from ]Mr. Ernest 

 AValker, State Horticulturist. Aul)urn, Alabaiiui: 



"On account of the presence of 'citrus canker' at various points along the gulf 

 coast, and tlu' anxiety of citrus growers in i)reventing any further spread of the 

 disease, this state has" decided to debar all fit ins frifoliatfi seedlings and grapefruit 

 trees, but to allow the shi|)ment of Satsunm orange trees only under 's])ecial permit.' 

 In order to obtain these i)ermits your nurserymen, in filing their nursery insi)ectiou 

 cei-tificates. should have thereon and accompanying the same a specific statement that 

 the trees are free from all infection by "citrus canker' and have not been exjjosed to 

 infection by this diseasi' from growing in the nurseries, orchards or other places near 

 trees infected by 'citrus canker.' " 



We urge all our county horticultural commissioners and growers in 

 citrus districts to keep a close watch out for any possible appearance 

 of this disease, for if once established here it would prove a calamity 

 to the state and certainly to our citrus interests. Identification will not 

 be ditYicult. In case an unusual disease is discovered look for the char- 

 acteristics referred to above. — A. J. C. 



General Citrus Quarantine. — Quarantine Order No. 8, adopted No- 

 \eml)er 11, 1914. by the Arizona Commission of Agriculture and Horti- 

 culture, reads as follows : 



In order to prevent the introduction of citrus insect and red spider pests and 

 destructive citrus diseases into the State of Arizona it is hei-eby ordered and declared : 



(a) That hereafter the introduction of citrus nursery stock, either budded or seed- 

 ling, into the State of xVrizona from any other state or territory is prohibited. 



(b) That all citrus buds, scions or seeds hereafter sliip])ed or brought into the 

 State of Arizona from other states or territories or from foreign c-ountries shall come 

 immediately under (|uarantine and must be held by the coiumon carrier or person or 

 persons iu possession of the same until the state entomologist has been notified and 

 a written order issued as to the dis])osition of such ([uarantined mattm'. 



