MANAGEMENT OF LEAF ROLLER Sylepta derogata Fab. (Lepidoptera: Pyralidae) ON SOME OKRA VARIETIES IN SAMARU AND KADAWA, NIGERIA
MANAGEMENT OF LEAF ROLLER Sylepta derogata Fab. (Lepidoptera: Pyralidae) ON SOME OKRA VARIETIES IN SAMARU AND KADAWA, NIGERIA
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Date
2021-04
Authors
ATULUKWU, Sunday Idenyi
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Abstract
Field trials were conducted at two locations namely Samaru in Zaria, Kaduna State and Kadawa,
Kano State during the 2019 wet season to determine the effects of five (5) okra varieties
(Clemson spineless, Ex-Basawa, Jokoso, Ex-Samaru and NHAE-47), three (3) insecticides
(Lambda-cyhalothrin, Cypermethrin + Dimethoate and Chlorantraniliprole + Lambda-
Cyhalothrin) with an Untreated control and time of sowing (July and August). Treatments were
arranged in a Randomized Complete Block Design (RCBD) and replicated three (3) times. A
total of four spray applications at two weeks‟ interval beginning from 7 WAS were carried out.
Observations were recorded on the larval count, percentage incidence, damage on leaves and
okra fruit yield. Variety Ex-Samaru recorded the least larval incidence of okra leaf roller at
Samaru (1.67 %) and Kadawa (1.67 %) while Variety Jokoso recorded the highest incidence of
leaf roller at Samaru (6.57 %) and Kadawa (7.33%). Plots sprayed with Ampligo
(Chlorantraniliprole + Lambda-Cyhalothrin) and Cyperplus (Cypermethrin + Dimethoate) were
found to have the least incidence at Samaru (1.67 %) while plots sprayed with Ampligo alone
recorded the least incidence at Kadawa (1.67 %). Lambda (Lambda-cyhalothrin) recorded the
highest incidence at Samaru (3.67 %) and Kadawa (3.06 %). Ex-Samaru recorded the least leaf
damage at Samaru (70.71 %) and Kadawa (70.71 %), while Jokoso recorded the highest leaf
damage at Samaru (82.21 %) and Kadawa (80.50 %). Also, plots sprayed with Ampligo recorded
the least leaf damage at Samaru (70.71 %) and Kadawa (70.71 %) over plots sprayed with
Cyperplus, Lambda and Untreated control in that order at both locations. At Samaru, varieties
sprayed with Ampligo was found to reduce the population of leaf roller over other insecticides
while at Kadawa, varieties sprayed with Ampligo and Cyperplus reduced the population of the
okra leaf roller. At both locations, plots sprayed with Lambda was the least effective over the
untreated control in reducing the leaf roller population. Larval population occurred first at 7
WAS for crops sown in July and 8 WAS for crops sown in August. The peak population period
was September and October (9WAS) for crops sown in July and August; respectively. Jokoso
variety recorded the highest larval population, while Ex-Samaru recorded the least larval
population. Ex-Samaru recorded the highest yield at Samaru and Kadawa while NHAE-47
recorded the least yield at Samaru and Kadawa. Crops sprayed with Ampligo produced the
highest yield at Samaru (3362.86 kg/ha) and Kadawa (4012.85 kg/ha) and crops sown in July
had more yield (3933.85 kg/ha) than crops sown in August (2822.31 kg/ha.)
Description
A DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES,
AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT
OF THE REQUIREMENTS FOR THE AWARD OF MASTER OF SCIENCE (MSc.)
DEGREE IN CROP PROTECTION
DEPARTMENT OF CROP PROTECTION,
FACULTY OF AGRICULTURE,
AHMADU BELLO UNIVERSITY,
ZARIA, NIGERIA
Keywords
MANAGEMENT OF LEAF ROLLER,, Sylepta derogata Fab. (Lepidoptera: Pyralidae),, OKRA VARIETIES,, SAMARU AND KADAWA, NIGERIA