45 * 



aud a half; iu the third, he estimates the cost of applying the sulphuret 

 of carbon in sufficient quantity to destroy the insect to be over ten cents 

 for each vine, which, on a large vineyard, would make it too costly to be 

 J) roll table. 



We merely give these facts in order to stimulate inquiry aud experi- 

 ment on this subject, and to warn vine-cultnrists not to be too sanguine 

 of new remedies until tested. 



In order to test the identity of the root aud leaf gall-lice, in the au- 

 tumn we inclosed some root-infested plants, sent from the vineyards of Mr. 

 George W. Campbell, Delaware, Ohio, (the originator of the Delaware 

 grape,) iu jiots, iu a AVardiau or nearly air-tight case, with some healthy 

 leafless vines from our own green-houses. We then cut off some of the 

 infested roots, and put them in juxtaposition with the roots of the healthy 

 vines, in order to find out if the healthy vines will become infested with the 

 root-lice, and vice versa. If the now leafless vines next season are attacked 

 by the leaf-louse, we shall consider the proof conclusive ; and further, 

 consider the two insects as identical, although in form and habits altered 

 by a residence above ground on the leaf, or under ground on the roots. 

 Mr. Campbell has also promised us a further supply of root-infested 

 vines next spring to continue our exi)erimeuts. 



The Phylloxera on fruit-trees. — Mr. Erni, United States consul 

 at Basle, Switzerland, writes to the Department that he learns from a 

 Berliu journal that the. Phylloxera vastatrix has been found extensively 

 on fruit-trees imported from France; and that the intention of the Ger- 

 man and Swiss governments is, in consequence of this discovery, to pro- 

 hibit the importation into those countries from France of fruit-trees, 

 as they have already done, for some time, of grape vines. 



Parts green as an inseciticide. — The assumption of patent-vend- 

 ers, and those interested with them in the sale of insect-destroying 

 compounds, that they are entitled to the credit of discovering the fact 

 that Paris green is not a healthy diet for insects, and to the emolument 

 of a monopoly of the sale of a well-known poison, is absurd as it is mer- 

 cenary. The writer made use of this substance in destroying insects 

 several years ago. Experiments have been made upon cotton-insects 

 for several years, and our correspondents have been encouraged to 

 make and report them more carefully thau ever the present year ; and the 

 unusual prevalence of the caterpillar has caused these trials to become 

 more or less general, and we have reported resulrs from nearly all the 

 cotton counties of the United States, as a matter of course, and do not 

 claim any special credit for the work, and we scout and deride any at- 

 tempt to make pecuniary or professional capital out of this subject. 



How to recognize the cotton-caterpillar. — As much confu- 

 sion has hitherto existed, and yet exists, relating to the appearance of 

 the true cotton-caterpillar, Anomis xylinw, and as there is another insect 

 (the grass-worm) infesting the cotton-fields about the same tinje the real 

 caterpillar makes its appearance, it will be welt to rei)eat a portion of 

 our report on this insect published six years ago, and mention some dis- 

 tinguishiug marks by which the cotton-moth may be recognized iu either 

 the egg, caterpillar, chrysalis, or perfect state. In the first place, the 

 egg of the cotton-worm is round and very much flattened in forui, and 

 of a green color, whereas the egg of the boll worm moth is round, some- 

 what bluntish, conical in shape, and of a yellow color. 



Insect and squirrel depredations. — The following extracts are 

 from the statistical correspondence of the Department : 



