Arizona republican., 1909-12-30
'C|TRuS TREE
 ITS ENEMIES Series of Circulars by Dr.. Morrill, 0n Pests A NEGLECTED SUBJECT| Which It Is the Purpose of
 Entomologist of the Hor-
 ticultural Commission to
 Bring to the Attention of Growers
A NEGLECTED SUBJECT

1 Dr. A. w. Morrill,. entomologist of | the Arizona Horticultural Commission l and of the Arizona Agricultural Exper- iment Station is preparing a series oi | circulars of interest to citrus growers which will be printed in The Republi- can. The object of thes circulars is tO bring before those interested in the citrus growing industry the work of the agricultural commission. the inn portance of citrus insect pests and the danger of importing new pests. There is a great deal of transformation and misunderstanding current concerning these matters and it is hoped that by means of the circular mentioned a better understanding will be obtained. The horticultural law enacted at the last session of the legislature is ap- proved by the majority of those who have permanent interests in citrus growing here, but the minority are oft en informed from unreliable sources and so fail to appreciate the situation.
 Among the topics to be discussed in circulars will be the following: Arizona
 
 Horticultural Law. Climatic Influence Upon Insect Pests. Citrus Pests of Florida and California and Their Con trol. the Distribution of Citrus Pests. White Flies Effecting Citrus. MealX Bugs. Soft Scale Black Scale. Purple Scale. California Red and Yellow Scales. Florida Red or Circular Scale. Orange Chionaspis. Cottony Cushion or White Scale. Mites and So-Called Spiders Treatment of Infested Nur- sery Stock and Horticultural Inspec- ton Service in Arizona. The various citrus pests to be treated will be con- present knowledge concerning the in fluence of climatic conditions upon them.
 Circular No on Arizona Citrus Pests and the Importance of the Hor- ticultural Law" is as follows:
 Comparative freedom from Insect pests is one of the main assets of the citrus fruit growing business in Ari- zona. It was in recognition of this fact that the citrus growers took an active part in securing legislative ac- tion for the purpose of protecting themselves against the importation of the numerous injurious insects which have burdened the citrus industry in Florida and in parts of California. 9th CT horticultural interests needed sim liar protection although it was already too late when the present law was enacted to save the losses arising from the introduction of the codling moth into the principal deciduous fruit growing districts of the territory or from the introduction of the woody aphis of the apple into the Gila valley. The injury to deciduous fruit interests by the lack of q horticultural law fur nishes an illustration close at hand of the danger of delaying such protective measures On the whole. however. it is seldom that legislative action has been so timely as in the case of the Arizona law.
 In Arizona. the citrus pests so far known to be established are not the most destructive ones. X single spec imen of the citrus mealy-bug has been found in two instances, but at present this pest need not be considered as
  spection service. however is demanded in order to locate local infestations which might become serious. The mealy bug will be discussed more at length in a later number of this series Df circulars
 The citrus thrips is at present our most injurious citrus pest The in jury from this insect is well described and illustrated by Dr. J. l.. Colt in a bulletin (No. 5S) entitled Citrus Gull ture in the Arid Southwest published by the Arizona Horticultural Experi- ment Station. The citrus thrips is the subject of special investigation in Tulare country. California. by the bu- reau of entomology. United States de- partment of agriculture. The amount | Df damage in that county is very great | nursery stock and young trees being | retarded and nearly all navel | oranges being more or less scared. | Early in october the writer estimated | hat in one section of Tulare county | nore than 80 per cent of the fruit | ,n the trees was scared sufficiently | O lower the grade The examination # 100 navel oranges from each of 10 different orchards. selected at random rom the field boxes as brought to the Phoenix packing house in the last nonth showed an average of 25 per ent injured by thrips sufficiently to educe the grade The extent of the amage in Tulare county to fruit and oliage allows the use of more expen- i've remedies than could be used prof tably in Arizona at present An in