Group Title: Press bulletin
Title: Mealy bug
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Full Citation
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Permanent Link: http://ufdc.ufl.edu/UF00090309/00001
 Material Information
Title: Mealy bug
Series Title: Press bulletin
Physical Description: 2 leaves : ; 23 cm.
Language: English
Creator: Watson, J. R ( Joseph Ralph ), 1874-1946
University of Florida -- Agricultural Experiment Station
Publisher: Florida Agricultural Experiment Station
Place of Publication: Gainesville
Publication Date: 1913
 Subjects
Subject: Mealybugs -- Control -- Florida   ( lcsh )
Citrus -- Diseases and pests -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: by J.R. Watson.
General Note: Caption title.
General Note: "June 21, 1913."
 Record Information
Bibliographic ID: UF00090309
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 83277056

Full Text
PRESS BULLETIN 214


UNIVERSITY OF FLORIDA



AGRICULTURAL EXPERIMENT STAlTON






MEALY BUG
By J. R. Watson
During the past few weeks citrus growers in many parts of the State
have been troubled with mealy bugs. This is perhaps largely due to dry
weather. It is a matter of common observation that these insects become
more abundant during dry seasons.
Control
Spraying is the best means to reduce their numbers. It is important
to have good pressure to force the liquid into corners and crevices, and
to wash many of the insects from their support. Washing them off
the trees is so effective that spraying with clear water is often sufficient to
control them. However, it is better to use an insecticide. One may take one
of the miscible oils which are used for whitefly, or whale-oil soap in the
proportion of one pound to from four to six gallons of water (according to
whether the water is soft or hard). Kerosene emulsion is fairly effective. To
make this dissolve one and a half pounds of soap in three gallons of hot
water, add three gallons of kerosene ahd mix by means of a pump, then dilute
to fifty gallons. If one has a power spray outfit with a good agitator he may
use a simple mixture of oil and water, taking five gallons of kerosene to
fifty gallons of water, and mixing thoroughly. However, unless one has a
good agitator he had better not try this, as burning may result unless the
mixing is thorough. A spray that is recommended in California is made by
dissolving two and a third pints of crude carbolic acid and two and a third
pounds of whale-oil soap in hot water, and diluting to make fifty gallons
of spray. If the first spraying does not result in satisfactory control, it may
be repeated after three or four weeks.
(These measures should also go far toward controlling the cottony cush-
ion scale which is getting to be quite noticeable in many groves in Pinellas,
Hillsboro, Polk, Manatee, and Citrus counties. The weather conditions that


June 2 1. 19 13













favor the increase in the numbers of mealy bugs seem to be likewise favor-
able to the increase of this pest.)

Life History
The female lays from 350 to 400 eggs in the cottony mass which she
secretes. The eggs hatch in eight to ten days in summer. The insects
move about more or less, but seldom migrate far. They congregate in hid-
den places, such as the bases of leaf-stalks, or the stems of fruit, or at the
forks of branches. A favorite place is between two oranges or grapefruits
that are in contact. These bugs require about six weeks to grow to full
size.
Enemies
Mealy bugs have many enemies which often effectively control them.
Among these are the lady beetles. The larvae of the lace-winged flies also
eat numbers of them. These larvae are flattish, soft-bodied insects a quar-
ter of an inch long or so, with sharp projecting jaws on which a mealy bug
or aphid is frequently seen impaled. The lace-wing lays her eggs on the
under side of the leaves, each egg being provided with a slender stalk
an inch or so long. These stalked eggs are laid in bunches and are a
familiar sight in orange groves. Another enemy of the mealy bug is the
larva of syrphus flies. The adult syrphus flies are grayish or brownish,
usually larger than the common house fly, but smaller than the blue-bottle
fly which they resemble in general shape. The larvae, which eat mealy
bugs, aphids and rust mites, are soft-bodied, legless grubs, and can occa-
sionally be seen making their way over the orange leaves.


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