1013.] rUBLIC DOCUMENT — No. 31. 43 



case of tho tomato, aro vorv badly curled, never possesshiii' the 

 tlexihility of liealtlij, normal leaves. 



We have also found this disease on other plants, Init have 

 not been able in every case to obtain iho same trouble by inocu- 

 lating back to tobacco, and vice versa. A. F. Woods (1) re- 

 l)orts this trouble as occurring on poke-weed {rhytolacca dc- 

 candra), and U. Suzuki (2) reports a similar trouble on the 

 mulberries of Japan caused by extreme cutting back. We 

 have also been able to produce the disease by pruning and in- 

 oculation of plants of rag-weed {Amhrosia artemisifoUa), -Jim- 

 son weed (Daiiira Stramonium, L.) and others, but we have 

 not been able to observe it in all its characteristics on i)otatoes, 

 even when severely pruned. It undoubtedly occurs on many 

 other ]Jants, but we should not confound it with the results 

 obtained from overfeeding, as the appearance of these two 

 troubles is under certain conditions almost identical. 



Occurrence. 



On the tomato we find that the disease occurs only on plants 

 grown in the greenhouse, or, in other words, forced plants, and 

 most often on such plants as are pruned, seldom making its 

 appearance on plants which are left normal. We have 

 never observed, this trouble on field-grown tomatoes, and, so 

 far as we are able to discover, no one has observed it on such 

 plants, probably for the reason that, as a rule, such plants are 

 not heavily pruned. We have not been able to obtain it 1)y 

 pruning mildly on normal field-grown tomatoes, and tho rea- 

 son for this is found in the fact that the plants get a normal 

 growth and are not forced, even though they may get a tem- 

 porary excess of food materials as a result of the pruning. 

 Forced, plants, of course, are more susceptible to diseases in 

 general, as has been proved over and over again by many in- 

 vestigators. 



The disease as it occurs on tomatoes has from our observa- 

 tions very little economic importance, as it does not, as a rule, 

 lessen the fruiting capacity of the vine or distort the fruit 

 badly. This observation has been made time and time again 

 in greenhouses in this and neighboring States. Occasionally, 



