On Mon, Sep 8, 2014 at 2:12 PM, calvin oda <codanspine@gmail.com> wrote:

General Comments

The new Gold hybrid varieties that are grown in Hawaii, (Central and South America, Africa, 

and the Far East) are significantly more susceptible to Pineapple Heart and Root Rot than 

traditional Smooth Cayenne varieties. Pineapple Heart and Root Rot are caused by Phytopthora 

cinnamomi and Pytopthora parasistica. P. cinnamomi may cause Pineapple Root Rot in cool, 

wet climates at higher elevations. P. parasitica causes Pineapple Heart and Root Rot in warmer 

areas at low elevations in Hawaii.

Pineapple Heart and Root Rot is usually confined to areas with high soil pH or poor 

drainage. The damage ranges from yield reductions by production of smaller fruits to complete 

crop failure if Pineapple Heart and Root Rot is not controlled. Plants with weak root systems 

also results in fruit lodging, sunburn, and crooked crowns.

Control of Pineapple Heart and Root Rot uses both cultural and chemical control 

practices. Effective management of soil pH, excellent land preparation, and installation of 

primary, secondary, and tertiary ditches are the most important factors in disease 

management. Pre-plant planting material dip treatments and foliar sprays of Aliette (or 

phosphorous acid) provide preventative controls to prevent diseases from reaching epidemic 

proprotions.

Specific Comments

Maximum Number of Applications

The current label allows a maximum of six foliar applications. If determined to be necessary, the 

maximum number of applications of Aliette per crop year may be reduced to a maximum of four 

applications per crop year.

Typical Application Rates

The typical application rate for Aliette in pre-plant planting material dip treatments is 2.5 lbs. 

formulation or 2.0 lbs. active ingredient in 100 gallons of water. Depending on the size of the 

planting material and the plant population densities, it takes about 175 to 275 gallons of 

treatment solution to treat one acre of planting material. 

The typical application rate for Aliette in foliar spray applications is 3.75 lbs. formulation or 3.0 

lbs. active ingredient in 250 gallons of water per acre. If determined to be necessary, the 

maximum single application rate may be reduced from 12.0 lbs. a.i./acre to 3.0 lbs. a.i. per acre.

The droplet size of foliar sprays at 250 gallons per acre are generally coarse in nature. Suggested 

changes to use instructions for foliar applications are acceptable.

Aerial Application
Aliette is applied with ground boom equipment only. Aerial applications can be prohibited in 

pineapple without any hardship to growers.

Lbs. A.I. Per Year and Percentage of Acreage Treated

The annual planted acreage has declined significantly in recent years. Under current conditions, 

approximately 670 acres are planted each year. 100 percent of the planted acreage is treated 

with a pre-plant dip treatment with Aliette (or phosphorous acid). At 2.0 lbs. a.i. per 100 gallons 

and average of 225 gallons of solution per acre for the seed treatment, approximately 3015 lbs. 

a.i. per year is used in pre-plant dip treatments.

The planted acreage or plant crop may be treated with about 3 foliar applications at 3, 6, and 9 

months after planting. The estimated lbs. active ingredient used to treat the plant crop acreage is 

about 6,030 lbs.a.i. per year.

The 1-ratoon crop may be treated with about 3 foliar applications at immediately post-harvest, at 

about three months post-harvest and at 1-ratoon crop force. The estimated lbs. a.i. per year for 

the 1-ratoon acreage is about 6,030 lbs. a.i. per year.

Total annual usage is estimated at about 15,075 lbs, a.i. per year.

If there are any questions, please do not hesitate to contact me. Aliette was the first truly 

effective fungicide for control of Pineapple Heart and Root Rot that was first registered in the 

early 1980's. Over the years, it's availability made it possible to develop the new Gold hybrid 

varieties into commercially viable products. We trust that the voluntary reductions in rates and 

the number of applications and restrictions in aerial applications will allow for continuation of 

registration of Aliette in pineapple.

Calvin