TREE INSECTS AND THEIR CONTROL 221 



the tender growth and cause dropping of 

 leaves, marring the appearance of the 

 tree and littering the ground underneath. 

 Trees are not seriously damaged. 



and burning them or dipping them in 

 kerosene. 



SYCAMORE 



LEAF-CHEWING INSECTS 

 Bagworm White-marked Tussock Moth 



(See descriptions and remedies under Elm) 



SAP-SUCKING INSECTS 

 Sycamore Lace Bug 



Habits While it does not kill trees 



and nor cause serious damage, this 



Damage, sap-sucking insect is respon- 

 sible for discoloring the foliage 

 of the Sycamore and for causing the pre- 

 mature falling of leaves, marring the 

 tree's beauty and littering the ground. 

 The bug appears in the spring, with the 

 starting of growth, and starts feeding on 

 the foliage. Within a week or two the 

 females deposit eggs on the under side of 

 leaves, and these hatch in another fort- 

 night. The young insects feed on the 

 leaves immediately. The adult bugs have 

 lacelike wings, prettily marked. They are 

 to be found with their wingless offspring, 

 in colonies on the under side of leaves. 

 Two or more generations are produced in 

 a single season. 



Remedy. The insect may be con- 

 trolled and destroyed by 

 spraying with soap solution, but this is 

 not necessary unless the invasion is un- 

 usually heavy. 



TULIP TREE 



SAP-SUCKING INSECTS 

 Tulip Tree Aphis 



Habits This species of sap-sucking 



and insect infests branches, twigs 



Damage, and leaves during the growing 

 season, feeding on the sap by 

 means of pointed beaks. The presence 

 of the aphis is indicated by sticky honey- 

 dew on the parts affected, and by ants 

 which feed on this honeydew. The aphis 

 causes leaves to curl and fall, littering the 

 ground, but no serious injury results. 

 In appearance the insect is reddish brown, 

 with pale green abdomen. 



Remedy. Spraying with 40 per cent, 

 nicotine sulphate is effectual in 

 destroying this insect. The spray should 

 be applied as soon as the presence of the 

 aphis is detected. 



