130 STATE BOARD OF AGRICULTURE. 



are covoiod with a lai'pjo nuiiilKT of ratlun* eoarso, t.iAvny hairs. The 

 larvae of bolli insccls leacli Ihcir full (l('\('lo]micTii aliont Iho first of 

 July, when tlicv ai-c nearly two iiiclics in Icnutli. Tlic ^y]>sy moth 

 larvae are very easy 1o (lis1iiif;\iish as lliev lia\<' a double row of lubei-- 

 cles aloiiji' IJieir backs. Tli(» live front lnl)er(Ies in each row are blue 

 and the six at the reai- ar<' red. The br<i\\Ti (ail lai\ae ha\<' a r<tw of 

 white spols oji each side of the body. 



As the introduction of both of lliese insi'cts is "really to be feared, 

 any one findinji' s])eciniens of insects reseniblinji- the above description 

 should send them in to the de])artment foi' ideniificalion. 



INSECTICIDES AND FUNGICIDES. 



In order that manufacturers of sprayinj; materials shall <;uaranlee 

 their strength so that the fruit grower may know wliat he is buying, act- 

 ing under Act 91. P. A. 1000. the manufacluiers have been coniiielled to 

 tile statements and sample labels in which the i)ercentages of the essen- 

 tial ingredients are guaranteed, and a permit for their sale in Michigan 

 is then issued. 



The National Insecticide Act of 1010 has the same object in view 

 but only deals with such insecticides and fungicides as enter into inter- 

 state commerce. As there are a half-dozen firms in ^Michigan which 

 manufacture insecticides and fungicides in large quantities, besides as 

 many more doing a small business, none of whose i)roducts sold within 

 the state come under the control of the TTnited States authorities, it 

 is highly imporlant. owing to the immense quant iiies used in Michi- 

 gan, that the work of supervision be kept up. 



Lime-sulphur solution and arsenate of lead are the kinds most exten- 

 sively used, and esjx'cial at lent ion has been ])ai(l to them. 



Bordeaux mixture is also made on a large scale by several finns l)ui 

 the use of the commercial brands by fruit growers has been discouraged 

 as, besides being considerably more expensive than if home made, wilh 

 the same amount of copper liydrate. i<s use has not been generally sat- 

 isfactory, and in fact as com])ai'ed wilh home made Bordeaux used at 

 the same time and in the same way, it has been demonstrated that 

 while the latter will give com])arative freedom from such troubles as 

 late blight of the potato and black rot of the grape, the results with 

 the conmiercial brands of Bordeaux mixture have been but little better 

 than where no spraying whatever was done. 



In passing upon the labels an endeavor has been made to secure un- 

 iformity in the statements and the terms used in the analyses so that 

 they can be compared. 



'"'"peach yellows'^ and '■'"little peach.'^ 



Owing to the fact that a large number of the older peach orchards in 

 the district where "peach yellows" and "little peach" have been most 

 troublesome have been very largely destroyed either by the winter or 

 other causes, the loss from the above diseases has been less noticeable. 



A careful watch of the orchards has been kept, particularly in Newaygo 

 anil southern '^^ason counties, in order that the further spread of the 

 diseases northward might be checked. As a result of this. ])ractically 

 no advancement has been noticed. In the more southern counties there 



