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VEGETABLE INSECTS 



The single stem system of tomato training is familiar to 

 most of you. The lateral branches are removed as fast as 

 the plant grows, and when the plant attains a height of about 

 five feet the terminal bud is removed. 



In greenhouses at Kennett Square, tomatoes are nearly al- 

 ways grown on the bench, but various blights and troubles 

 are causing a great deal of trouble in this district. I believe 

 that for inexperienced growers the results will be more uni- 

 form in beds than on benches where conditions are more 

 artificial. 



Mr. Greffrath : The subject for the hour before us is 

 ^'Vegetable Insects." Every grower who raises any kind of 

 a vegetable has had some trouble with insects. Professor 

 Herrick. 



VEGETABLE INSECTS. 



G. W. Herrick, Ithaca, New York. 



I do not quite know what to discuss with you this morn- 

 ing, and I am going to leave it partly to you. I have a few 

 slides, and then I should like to have you ask any questions 

 you desire concerning vegetable insects, which I shall try to 

 answer. 



It is a fact that vegetables are infested with a great variety 

 of insects, and it becomes a study by itself really to learn 

 about these insects that attack vegetables. It is a wide field 

 to cover. 



The Cabbage Root Maggot. 



I am going to discuss first of all the cabbage root maggot. 

 I presume those of you that have grown cabbages or radishes 

 are acquainted with this maggot. It is a white worm-like 

 insect which develops from the egg deposited by a small fly. 

 This fly belongs to the same group of insects to which the 

 house-fly belongs. The adult insect, which is somewhat 

 larger than a mosquito, appears in the early spring and de- 

 posits its whitish eggs, which I presume you have never seen, 

 because they are rather inconspicuous, next to the root or 

 stem of the cabbage in crevices of the soil ; or possibly where 



